Category Archives: Chess Engines

If the startling progress of artificial intelligence suggests well soon be bowing down to our robot overlords, Garry Kasparov advises us: Dont panic.

Yes, that Garry Kasparov, the Russian former world chess champion who infamously lost to IBMs computer Deep Blue in 1997, sparking existential dread that humans were on their way to obsolescence.

But as Kasparov reminds us in his new book, Deep Thinking: Where Machine Intelligence Ends and Human Creativity Begins, he had defeated Deep Blue the year before and, after his loss, IBM refused to offer a rubber match.

On the phone from his New York City home, Kasparov maintains that this was a pure corporate decision: they evaluated that the next match would be uncertain.

Looking back at that time, Kasparov realizes how much help the computer had behind the scenes, from fallible humans. And even todays much-improved chess programs, it seems, lose out to humans and machines working in tandem. In other words: if you cant beat IBM, join em.

Human-machine teams can take advantage of the formers intuition and the latters deduction, says Kasparov, and they point the way to an ideal collaboration in our work and our daily lives. He calls Tesla guru Elon Musks latest venture, the development of a brain/computer interface, a move in the right direction.

In the future, will we all be cyborgs with chess engines connected to our brains? We dont know, says Kasparov. And many people are afraid of hearing, We dont know. I encourage it. If you dont know, thats not the reason to stop.

Since retiring from professional chess in 2005, Kasparov has become a polymath: campaigning for human rights, organizing opposition to Vladimir Putin, giving corporate speeches and spending time at Oxford Universitys Future of Humanity Institute, where researchers have worked toward whole brain emulation or recreating the work of a brain in software.

Kasparovs book, which was out May 2, offers a potted history of AI, focusing on the quest to produce an unbeatable chess-playing machine, which became a common goal among researchers because of what he calls the questionable mystique that chess prowess represents intelligence.

In the early days, programmers wanted machines to analyze patterns and zoom in on potentially good moves (as humans do), but with the advance of calculating power it became much more effective to try brute force: figuring out potential outcomes of all possible moves in one particular position, a certain number of moves ahead.

This worked tremendously for chess but not for producing smarts: Deep Blue, Kasparov insists, was in fact as intelligent as an alarm clock. Having beaten Kasparov, IBM took its AI in more promising directions toward programs that gather data and then extrapolate.

Other companies have done so too: a version of Googles self-learning computer program Alpha Go has beaten many of the worlds best players of Go, the ancient Chinese strategy game that is far more complex than chess. There is, however, a troubling technical issue.

The program, says Kasparov, learns in ways that are impossible for us even to contemplate. . . . The creators dont know why one version of Alpha Go plays better than the other. If theres a glitch in Alpha Go, Im not sure they know where to look.

An unfathomably wonky game-playing program is one thing, but what about AI-based stock traders, or doctors, or self-driving cars, where glitches could be disastrous? Humans can coach machines and, in Kasparovs view, our guidance and vision will enable both machines and humans to work better.

And we might as well make the most of this possibility, because the march of these programs, and their encroachment on our employment, is unstoppable.

Its progress. I think the only answer is to move forward, to create new industries, new opportunities where machines will have to rely on our intuition since well be entering new zones like reactivating space exploration, going deep underwater, creating situations where our creativity prevents us from becoming redundant.

But can everyone participate? His vision sounds suspiciously utopian. What do we do, for instance, about veteran industrial workers who are being laid off, for whom its a stretch to retrain as software designers? Kasparov admits he has no ready solution. They will be hijacked by populists from left or right. . . . It is a challenge, but if you try to stop this process by imposing restrictions theres no way you can win.

We just have to accommodate ourselves. This is part of our history as the human race. Some people could be more successful, some less. I lost to a machine, but Im promoting an idea of our co-operation, because thats a way to move into the future. And I dont want people to think about AI and machines as surrounded by the fog of secrecy.

Yet secrecy seems inevitable with AI, as its being developed by Silicon Valley. Are we to trust that big companies proprietary technology will have our interests at heart? Kasparov admits to some misgivings, but he notes that asking these companies to lift the veils from the way they develop their software could also cause problems. Their work could be then open to abuse from regimes such as Vladimir Putins, looking to adapt them for nefarious ends.

In other words, even though the machines arent out to get us, humans in control of these machines may yet be.

Lets move into the future with our eyes open, Kasparov warns. I hope that my book will help.

A dangerous game

Garry Kasparov is one of Vladimir Putins most outspoken critics; in his book Winter is Coming (2015), he set out his view of how the United States policy of appeasement has helped the Russian president. Here, he speaks about why Donald Trump, improbably, could change the game.

Whats your take on the aftermath of the cruise missile attack on Syria, with relations between the U.S. and Russia now said to be at a low point?

Relations were already at a low point. Putins propaganda has been using America as a scapegoat for any failures of domestic policy; America, as a sworn enemy, was on Russian television for years. Obama could pretend that they were looking for common ground. The Trump administration simply recognized reality.

Trump has very strong survival instincts; the man has survived so many bankruptcies. The way for him to survive as a politician is to do something good for America. If it goes against what he said on the campaign trail and he said many stupid things there so be it. Trump clearly sees that his personal strategic interest is now to comply with American interests and the interests of American traditional allies. Thats why he changed his views on NATO, on the Middle East, on China.

What implications might this have for Putin?

It could have huge implications, because his bluff is (being called) by a power far more capable of creating damage. I think psychologically it had a huge effect, because after eight years of Obamas inaction and attempts to pacify every conflict, America is back in the game. Now, Putin will have great difficulties convincing the Russian military to go into another engagement.

I think it will restrain Putins power to cause damage, (but) its one move. When you are in a very complicated, dangerous position, one good move doesnt solve all the problems.

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Garry Kasparov's next move: teaming up with machines - Toronto Star

The impressive boat has its own helipad and sailed across the Atlantic in just eight days

A BILLIONAIRES 40million super yacht turned heads as it cruised into a British port.

The stunning Lady M, owned by Russias richest man Alexei Mordashov, was spotted in Whitehaven, Cumbria, today.

North News and Pictures

North News and Pictures

North News and Pictures

PA:Press Association

PA:Press Association

PA:Press Association

PA:Press Association

The incredible 210-foot yacht, which boasts its own helipad, is berthed in the towns harbour, reports the News and Star.

Its owner Mr Mordashov, a close pal of Russian President Vladimir Putin, is the main shareholder and chairman of steel and mining company Severstal.

The beautiful yacht waspictured at anchor on the river Clyde in Glasgow, Scotland, two weeks ago.

Passers-by gazed admiringly at the three-deck vessel on the harbourside after it sailed into Whitehaven on Sunday night.

The vessel can sleep up to 12 guests in its six cabins. It also has a crew of 14 who share seven cabins.

The Lady M is powered by two MTU 16V4000 engines and she can hit her top speed of 28 knots from zero in just one minutes 28 seconds, according to boatinternational.com.

Its Captain Gordon Scott previously said Lady M was an extremely safe and comfortable sea boat.

We crossed the North Atlantic in under eight days and I was very impressed with the comfort in a seaway.

The long, fine bow entry has a lot to do with this.

Steel company magnate Alexei Mordashov, 51, is understood to have a fortune of 12.9billion.

The married dad-of-six stepped down aschief executive of firm Severstal in 2015 after 19 years at the helm.

He owns stakes in TUI Group, the worlds largest touring company, as well as gold mining and engineering firms.

He is a council member at the Bolshoi Theatre and Russian Chess Federation.

He grew up in Cherepovets, 230 miles north of Moscow where both parents worked at the local steel mill

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A member of crew gives sister vessel Little M a hose down

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Russia's richest billionaire Alexei Mordashov's incredible 40million Lady M 'super yacht' dwarfs fishing boats as ... - The Sun

The just concluded Gashimov Memorial had a few interesting moments. The great positional player and former world champion, Vladimir Kramnik, decided to channel Mikhail Tal and sacrificed a rook for three pawns versus Pentala Harikrishna. Even though the engines say it is wasnt any good, the defense was just too hard for a human. We reproduce the game here:

Kramnik Harikrishna; 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.00 Be7 6.d3 b5 7.Bb3 d6 8.a3 00 9.Nc3 Nb8 10.Ne2 Nbd7 11.c3 Bb7 12.Ng3 c5 13.Re1 Rc8 14.Nf5 c4 15.dxc4 Bxe4 16.Nxe7+ Qxe7 17.cxb5 axb5 18.Bg5 Nc5 19.Ba2 h6 20.Bh4 g5 21.Bg3 Bh7 22.Qe2 Kg7 23.Rad1 Nfe4 24.Rd5 f5 25.Rxe5!!?? dxe5 26.Bxe5+ Nf6 27.Qxb5 Nce4 28.Bd4 Rfd8 29.h3 Rb8 30.Qe2 Bg8 31.Bb1 Qb7 32.b4 Re8 33.c4 Qc6 34.Qb2 Rbd8 35.c5 Qe6 36.b5 Kf8 37.c6 g4 38.hxg4 fxg4 39.Bxe4 gxf3 40.Bxf6 Rd6 41.Bg7+ Kf7 42.Be5; 10

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American champ, Wesley So, ground down the great defensive stars Sergey Karjakin and Vladimir Kramnik in endgames no less, which doesnt happen every day. Pavel Eljanov, in a tweet, compared himself to Santa Claus as he gave so many gift points to his rivals and promised to be a bad Santa the next time around.

Todays game is another point of interest. Shakhriyar Mamedyarov was just cruising to back-to-back wins in this important hometown event when he lost to Radoslaw Wojtaszek, who adopted a damn the torpedoes attitude, and assayed a very, very sharp line in the Gruenfeld. To his credit, Mamedyarov hung on to win.

2017 Gashimov Memorial, Shamkir, Azerbaijan

Wojtaszek (2745) Mamedyarov (2772)

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1.Nf3 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.Qb3 Nb6 6.d4 Bg7 7.e4 Behold the Gruenfeld Defense. 7...Bg4 8.Bb5+ c6 not 8...Nc6 9.d5 9.Ng5 00 10.Be2 Bxe2 11.Nxe2 As 11Na6 is not holding up in practice, maybe 11..c5 deserves a look or 11...h6 first, driving the knight back, and then 12Na6 11...Na6 11...Bxd4 may be playable but looks very dangerous after... 12.Qh3 h5 13.g4 12.Qh3 h6 13.Nf3 h5 Why not 13h6? The engines have nothing really bad to say about it and it does avoid Whites attack. 14.Rg1! Nb4 15.g4 No beating around the bush here. 15...Qd7 16.Qh4! Whats a rook when theres mate in the air? 16...Nc2+ 17.Kf1 Nxd4 A change of plans as taking the rook, upon reflection, is just too dangerous, for example: 17...Nxa1 18.gxh5 Bf6 19.Bg5 Bg7 20.h6 Bf6 21.Bxf6 exf6 22.h7+ Kh8 (22Kg7 23.Ng3!) 23.Qxf6+ Kxh7 24.Rg3 Kg8 25.Ne5 Qd8 26.Qf5 Qd6 27.Nxg6 Qxg6 28.Rxg6+ fxg6 29.Qxg6+ which should be winning for White 18.Nexd4 Bxd4 19.gxh5 The assault begins and at no cost! 19...Bf6 20.Bg5 Bxb2 After 20...Bxg5 21.Rxg5 Qd3+ 22.Kg2 f6 23.hxg6 Qxf3+ 24.Kg1 Rf7 25.Rg3 Qe2 26.Rh3 Black will eventually be mated. 21.Re1 Qd3+ 22.Kg2 f6!? Very tricky! Now what happens after the apparent winning 23.hxg6, threatening mate? 23.Bh6 and not 23.hxg6 due to the shot 23Qxf3+!! 24.Kxf3 (or 24.Kf1 Qxf2+ 25.Qxf2 fxg5 26.Rxg5 Rxf2+ 27.Kxf2) 24...fxg5+ 25.Kg2 gxh4 and in both cases, Black is winning! 23...g5 or 23...Rfe8 24.hxg6 and it is very hard to stop mate after either 25.Bg7 or 25.Be3 24.Nxg5! Rf7 25.Nxf7 Kxf7 Not only is White up material but his king is a lot safer than Blacks and dont forget about Whites passed h-pawn! 26.Re3 Qc2 27.Rg3 Bd4 28.Rg7+ Ke6 29.Qg4+ Kd6 30.Be3 Bxe3 31.Qg3+ Down material and with an exposed king, Black had enough; 10

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Chess notes - The Boston Globe

John McGrath, Sports viewpoint 5:15 p.m. PT May 7, 2017

John McGrath, Tacoma News Tribune(Photo: TNT)

SEATTLE As Jerry Dipoto was revealing details of the forearm strain that put James Paxton on the disabled list Friday, the Mariners general manager stood a few feet away from a Gaylord Perry jersey display.

The symbolism was rich.

Invited to throw the ceremonial first pitch Saturday the 35th anniversary of the Hall of Famers 300th victory Perry, 78, has vivid memories of his astonishingly brief history with the disabled list.

He hurt his ankle sliding into second base in 1966. The injury forced Perry to miss two weeks, but soon he was back on the mound, resuming a career remarkable for its durability.

Between 1962 and 1983, Perry made 690 starts, threw 303 complete games and faced 21,953 batters, yet never suffered the kind of arm problems plaguing Paxton and fellow starters Felix Hernandez and Drew Smyly.

An ability to avoid injuries requires some good luck, but as Branch Rickey liked to say, luck is the residue of design. Perry adhered to a self-taught winter workout routine that stressed conditioning before throwing.

Every year, at my home in North Carolina, Id run sprints and do resistance exercises to get my shoulder, elbow and legs strong, Perry said Friday. Id do that for 30 days, beginning on Jan. 1. I did not pick up a baseball until Feb. 1, when Id play catch with my dad or my son. When Id get to spring training, I was ready to go six innings nobody else was as ready as that.

I think the arm problems pitchers have now could be corrected by the right exercises. I wanted my arm to be strong. I wanted to pitch a lot of innings and I didnt want to get my arm to get tired. You had to do it religiously, though. You couldnt just do it once a week. I did it at least five times a week.

In March of 1982, Perry owned 297 lifetime victories and no job. But his workout-warrior discipline led to a spring-training tryout offer from Mariners general manager Dan OBrien.

I finally found someone who gave me a chance to pitch for a couple more years, said Perry. I played for Dan in Texas. He knew I was in good condition and said, Come on in.

Perry arrived in camp on March 5, two weeks after pitchers and catchers reported. He was named the opening day starter at Oakland and went the distance.

In his Kingdome debut for the Mariners, against the Angels on April 20, Perry broke a team record by striking out 13. He was 43 years old.

Not since Early Wynn, in 1961, had a pitcher won 300 games. Perry beat the Yankees at New York for No. 299 on April 30 and then, six days later, beat them again for the milestone.

He gave up nine hits in the 7-3 victory, striking out four while walking one. Not a dominant performance, but a complete game with minimal late-inning drama.

In other words, by todays standards, a gem.

Nobody goes nine innings anymore, said Perry. I dont think theyre taught to go nine innings. The manager and general manager and pitching coach wont let starters go more than five or six innings.

Perry is remembered for doctoring baseballs with a grease that created a sinking action. The illegal pitch maddened opponents and defined his legacy, and while theres no doubt he dabbed the ball on occasion, the most tangible benefit of the greaseball was its potential to get inside the head of a hitter.

Perry knew that, and played the is-he-cheating-or-not? card as as a ruse. When a pitcher reputed to apply grease on a ball puts his fingers on the bill of his cap once, twice, three times it tends to distract a hitter from the task at hand.

Perry grew up working in the fields of the family tobacco farm. Casual fans heard his drawl and presumed he was an easy-going bumpkin.

Wrong. Perry had street smarts or, more accurately, rural highway smarts. A gifted 6-foot-4 athlete who declined a chance to pursue a Division I college basketball career, he combined his versatile pitching repertoire with the focus of a chess master.

If there was an edge to be had, the big lug took it.

I always watched the opposing club hit during batting practice, he said. Id see who was taking good cuts and who was working on something, either pulling the ball too much or getting the ball off the ground.

Although Perry believes starting pitching has become a lost art six serviceable innings are the new complete game he has no doubt baseball players are better equipped to maximize their ability than they were in 1961, when he was a Triple-A star with the Tacoma Giants.

Take travel, for instance. Perry can recall flights from Cleveland to Detroit in a DC-6 plane spewing oily smoke from the engines.

There was a lot of praying as we crossed over the lake, he said. It got so bad we had a team meeting and decided to take the bus.

Swimming, Perry noted, was not a skill.

Then again, a pitcher who throws 303 complete games without any arm, shoulder or elbow issues doesnt have to swim.

He just changes into his cape and resumes the flight alone.

John McGrath is a columnist for the Tacoma News Tribune. Contact him atjmcgrath@thenewstribune.com.

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Complete mastery: Gaylord Perry's durable legacy - Kitsap Sun

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Win 2016/06/13 Shatranj 1.18 Sam Tannous - XB Python source; requires Python2 interpreter with '-u' option invoked (to disable i/o buffering) 2016/05/30 Betsab II 1.66 Juan Benitez, Dieter Steinwender, & Chrilly Donninger 1.66 Kirill Kryukov JA builds JA Linux builds Julien Marcel Mac builds XB, UCI C source w/ Spanish comments & var names; Linux, Mac, Win; this is a MiniMAX derivative 2016/05/22 CaveChess r62 Tim Declercq SJCE* r61 PN XB Java source, cross-platform Java jar; SJCE* indicates engine is one of many contained in the package 2016/05/22 ChessBotX 1.02 Alexander Soto & Roman Koldaev SJCE* XB Java source, cross-platform Java jar; SJCE* indicates engine is one of many contained in the package 2016/05/22 Cupcake 1.1c Dan Honeycutt SJCE* Kirill Kryukov JA builds XB Java source, cross-platform Java jar; Win; SJCE* indicates engine is one of many contained in the package 2016/05/22 Gladiator 0.0.7 David Garcinuo Enrquez SJCE* XB Java source (Spanish comments); cross-platform jar file; SJCE* indicates engine is one of many contained in the package 2016/05/22 Phoenix 1.13a A R Rahul info SJCE* UCI Java source, cross-platform; CuckooChess derivative; SJCE* indicates engine is one of many contained in the package 2016/05/22 Stupid DJ Steinar H Gunderson DJ (Win) Tony Mokonen Win builds UCI C source; Win 2016/05/15 BDI Chess 0.0.6 TM Riccardo Mazzei Tony Mokonen XB C++ source; BSD, Mac, Win; not a serious engine 2016/05/15 Chess0 0.6 Claudio M Camacho - XB C++ source; Linux, Mac, Win; requires separate dlls (not included) 2016/05/15 Randomizer LL Luca Lissandrello - UCI random-mover; not a serious engine 2016/05/15 RedQueen 1.1.98 Ben-Hur Carlos Langoni Jnior Tony Mokonen 1.1.98 LM (Win32) alt source Kirill Kryukov JA builds JA Linux builds Julien Marcel Mac very old build UCI C++ source; mp; Linux, Mac, Win; requires extra dlls (included) 2016/05/15 Robocide 20160510 TM Daniel White Tony Mokonen UCI C source; Win 2016/05/15 Spartan 1.0 Christian Daley Tony Mokonen Win builds UCI C source; Mac, Win[TM]; successor to JFresh engine 2016/05/08 Claudia 0.5 Beta Antonio Garro - UCI C source; uses Polyglot books; Win 2016/05/08 Phalanx XXV Duan Dobe SDChess Kirill Kryukov JA builds JA Linux builds Julien Marcel Mac builds XB C source; Linux, Mac, Win 2016/04/25 Hakkapeliitta TCEC(Win64) Mikko Aarnos downloads UCI C++ source; supports Syzygy egtbs; Linux, Win 2016/04/19 Muse 0.953 Martin Fierz - XB, UCI Win64 2016/04/19 OBender 03.2016 AF Evgeniy Korniloff & Serg Nifont 03.2016 AF Kirill Kryukov JA builds JA Linux builds SD Chess Julien Marcel Mac builds alt site XB C source; own GUI (Echoboard/Winboard); Linux, Mac, Win 2016/04/12 Cinnamon 2.0 Giuseppe Cannella old downloads Kirill Kryukov JA builds JA Linux builds UCI C++ source; mp; package comes with Tarrasch Chess GUI (Windows only); Linux, Mac, Win; perft with source also available; engine formerly known as Butterfly 2016/04/04 Orion 0.3 David Carteau - UCI Win64 2016/03/20 Cheese 1.8 Patrice Duhamel JA Linux builds XB, UCI multiPV; limit strength; FRC; Linux, Mac, Android, Win 2016/02/20 Fairy-Max 5.0b Harm G Muller Win32 Julien Marcel Mac builds (old) XB C source; multi-PV; Linux, Mac, Win; variants 2016/02/20 Tucano 6.00 Alcides Schulz JA Linux builds Julien Marcel Mac very old build XB C source; Linux, Mac, Win; successor to Sedicla engine 2016/02/08 Rodin 8.0 Fermin Serrano - XB Win 2016/01/22 CeruleanJS 0.1.1 Joey Robert - XB JavaScript source; supports Polyglot opening books; Win64; requires a special browser to run 2016/01/22 Clownfish 01 Luca Vallisa 01 XB Win 2016/01/16 Quokka 2.0 DJ Matt Palmer 2.0 DJ UCI C++ source; Win 2016/01/10 Donna 4.0 Michael Dvorkin - UCI Go source; Linux, Mac, Win; support for Polyglot opening books 2016/01/10 simple UCI chess engine ??? Alexey Syromyatnikov - UCI Python source; buggy engine 2016/01/10 ThePlayer Engine 1.0 Willy Rempel & Nick Seelert - UCI Java source; buggy engine 2016/01/04 iCE 3 Thomas Petzke blog UCI multiPV; ownGUI; Win; iCE = 'improved chess engine'; successor to the mACE engine

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Chess Engines list @wiki - Computer Chess Wiki

Top Chess Engine Championship formerly known as Thoresen Chess Engines Competition (TCEC or nTCEC) is a computer chess tournament that was organized, directed, and hosted by Martin Thoresen until the end of Season 6; from Season 7 onward it has been organized by Chessdom. It is often regarded as the Unofficial World Computer Chess Championship because of its strong participant line-up and long time control matches on high-end hardware, giving rise to very high-class chess.[1][2]

The first TCEC was in 2010. After a short break in 2012,[3] TCEC was restarted in early 2013 (as nTCEC)[4] and is currently active (renamed as TCEC in early 2014) with all-day live broadcasts of chess matches on its website. Supported by original engine authors and based on voluntarism and donation, it caused a furor in February 2011, when the free version of Houdini defeated reigning computer chess champion Rybka in a 40-game match.[5][6]

The current season of TCEC is sponsored by Chessdom Arena.[7][8]. The current TCEC champion is Stockfish 8, which defeated Houdini 5 in the TCEC Season 9 Superfinal 100-game match held in November - December 2016.[9]

The TCEC competition is divided into Seasons, where each Season happens over a course of a few months, with matches played round-the-clock and broadcast live over the internet. Each season is divided into 4 qualifying stages and 1 Superfinal, where the top two chess engines battle it out over a series of 64 games to win the title of TCEC Grand Champion.

The time control in all events is 120+30 (120 minutes + 30 seconds added per move for the whole game) and pondering is set to off. The Opening Book is taken from recent strong human Grandmaster tournaments, is truncated to the first 6 or 8 moves, and is changed in every Stage. Engines are allowed updates between stages, unless there is a critical play-limiting bug, in which case the engine are allowed to be updated once during the stage. TCEC generates its own elo rating list from the matches played during the tournament. An initial rating is given to any new participant based on its rating in other chess engine rating lists.

There is no definite criterium for entering into the competition, other than inviting the top participants from various rating lists. The list of participants is personally chosen by Thoresen before the start of any new season. His stated goal is to include "every major engine that is not a direct clone".[10] Usually chess engines that support multiprocessor mode are preferred (8-cores or higher). Both Winboard and UCI engines are supported. Large pages are disabled but access to various endgame tablebases is permitted.

A game can be drawn by threefold repetition or fifty-move rule. However, a game can also be drawn at move 40 or later if the eval from both playing engines are within +0.05 to -0.05 pawns for the last five moves, or ten plies. If there is a pawn advance or a capture, this special draw rule resets and starts over. On the website, this rule shows as "Distance in plies to TCEC draw rule". It adjudicates as won for one side if both playing engines have an evaluation of at least 6.50 pawns (or -6.50 in case of a black win) for four consecutive moves, or eight plies - this rule is in effect as soon as the game starts. The GUI also adjudicates tablebase endgame positions (with 5-men or less) automatically.

N.B.: tablebases were disabled for all engines for the whole of Season 7.[10]

Shredder vs Gull, TCEC S4

Pre-TCEC:

Season 1-3:

Season 4:

Season 5:

Season 6:

Season 9:

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Top Chess Engine Championship - Wikipedia

This article is about the Western board game. For other chess games or other uses, see Chess (disambiguation).

Chess is a two-player strategy board game played on a chessboard, a checkered gameboard with 64squares arranged in an 88 grid.[1] The game is played by millions of people worldwide.

Each player begins with 16 pieces: 1 king, 1 queen, 2 rooks, 2 knights, 2 bishops, and 8 pawns. Each of the six piece types moves differently, with the most powerful being the queen and the least powerful the pawn. The objective is to checkmate[note 1] the opponent's king by placing it under an inescapable threat of capture. To this end, a player's pieces are used to attack and capture the opponent's pieces, while supporting each other. In addition to checkmate, the game can be won by voluntary resignation of the opponent, which typically occurs when too much material is lost, or checkmate appears unavoidable. A game can also in several ways end in a draw.

Chess is believed to have originated in India sometime before the 7th century, being derived from the Indian game chaturanga, which is also the likely ancestor of the Eastern strategy games xiangqi, janggi, and shogi. (A minority view holds that chess originated in China.) The pieces assumed their current powers in Spain in the late 15th century; the rules were finally standardized in the 19th century. The first generally recognized World Chess Champion, Wilhelm Steinitz, claimed his title in 1886. Since 1948, the World Championship has been regulated by FIDE, the game's international governing body. FIDE also organizes the Women's World Championship, the World Junior Championship, the World Senior Championship, the Blitz and Rapid World Championships, and the Chess Olympiad, a popular competition among international teams. There is also a Correspondence Chess World Championship and a World Computer Chess Championship. Online chess has opened amateur and professional competition to a wide and varied group of players.

FIDE awards titles to skilled players, the highest of which is grandmaster. Many national chess organizations also have a title system; however, these are not recognized by FIDE.

Until recently, chess was a recognized sport of the International Olympic Committee;[2] some national sporting bodies such as the Spanish Consejo Superior de Deportes also recognize chess as a sport.[3] Chess was included in the 2006 and 2010 Asian Games.

Since the second half of the 20th century, computers have been programmed to play chess with increasing success, to the point where the strongest home computers play at a higher level than the best human players. Since the 1990s, computer analysis has contributed significantly to chess theory, particularly in the endgame. The computer IBM Deep Blue was the first machine to overcome a reigning World Chess Champion in a match when it defeated Garry Kasparov in 1997. The rise of strong computer programs (called "engines") runnable on hand-held devices has led to increasing concerns about cheating during tournaments.

There are also many chess variants which utilize different rules, pieces, or boards. One of these, Chess960 (originally "Fischerandom"), has gained widespread popularity as well as limited FIDE recognition.

The official rules of chess are maintained by FIDE (Fdration Internationale des checs), chess's international governing body. Along with information on official chess tournaments, the rules are described in the FIDE Handbook, Laws of Chess section.[4]

Initial position, first row: rook, knight, bishop, queen, king, bishop, knight, and rook; second row: pawns

Chess is played on a square board of eight rows (called ranks and denoted with numbers 1 to 8) and eight columns (called files and denoted with letters a to h). The colors of the 64 squares alternate and are referred to as light and dark squares. The chessboard is placed with a light square at the right-hand end of the rank nearest to each player.

By convention, the game pieces are divided into white and black sets, and the players are referred to as White and Black respectively. Each player begins the game with 16 pieces of the specified color, which consist of one king, one queen, two rooks, two bishops, two knights, and eight pawns. The pieces are set out as shown in the diagram and photo, with each queen on a square of its own color, the white queen on a light square and the black queen on a dark.

The player with the white pieces always moves first. After the first move, players alternately move one piece per turn (except for castling, when two pieces are moved). Pieces are moved to either an unoccupied square or one occupied by an opponent's piece, which is captured and removed from play. With the sole exception of en passant, all pieces capture by moving to the square that the opponent's piece occupies. A player may not make any move that would put or leave the player's own king under attack. A player cannot "pass"; at each turn one must make a legal move (this is the basis for the finesse called zugzwang).

If the player to move has no legal move, the game is over; it is either a checkmate (a loss for the player with no legal moves) if the king is under attack, or a stalemate (a draw) if the king is not.

Each chess piece has its own way of moving. In the diagrams, the dots mark the squares where the piece can move if there are no intervening piece(s) of either color.

Once in every game, each king is allowed to make a special move, known as castling. Castling consists of moving the king two squares along the first rank toward a rook (which is on the player's first rank[note 2]) and then placing the rook on the last square that the king has just crossed. Castling is permissible under the following conditions:[5]

When a pawn advances two squares from its starting position and there is an opponent's pawn on an adjacent file next to its destination square, then the opponent's pawn can capture it en passant (in passing), and move to the square the pawn passed over. This can only be done on the very next move, otherwise the right to do so is forfeit. For example, if the black pawn has just advanced two squares from g7 (initial starting position) to g5, then the white pawn on f5 may take it via en passant on g6 (but only on White's next move).

When a pawn advances to the eighth rank, as a part of the move it is promoted and must be exchanged for the player's choice of queen, rook, bishop, or knight of the same color. Usually, the pawn is chosen to be promoted to a queen, but in some cases another piece is chosen; this is called underpromotion. In the diagram on the right, the pawn on c7 can be advanced to the eighth rank and be promoted to an allowed piece. There is no restriction placed on the piece that is chosen on promotion, so it is possible to have more pieces of the same type than at the start of the game (for example, two queens).

When a king is under immediate attack by one or two of the opponent's pieces, it is said to be in check. A response to a check is a legal move if it results in a position where the king is no longer under direct attack (that is, not in check). This can involve capturing the checking piece; interposing a piece between the checking piece and the king (which is possible only if the attacking piece is a queen, rook, or bishop and there is a square between it and the king); or moving the king to a square where it is not under attack. Castling is not a permissible response to a check. The object of the game is to checkmate the opponent; this occurs when the opponent's king is in check, and there is no legal way to remove it from attack. It is illegal for a player to make a move that would put or leave the player's own king in check.

In casual games it is common to announce "check" when putting the opponent's king in check, but this is not required by the rules of the game, and is not usually done in tournaments.

Games can be won in the following ways:

There are several ways games can end in a draw:

Chess games may also be played with a time control, mostly by club and professional players. If a player's time runs out before the game is completed, the game is automatically lost (provided the opponent has enough pieces left to deliver checkmate). The duration of a game ranges from long games played up to seven hours to shorter rapid chess games, usually lasting 30 minutes or one hour per game. Even shorter is blitz chess, with a time control of 3 to 15 minutes for each player, and bullet chess (under 3 minutes). In tournament play, time is controlled using a game clock that has two displays, one for each player's remaining time.

Chess games and positions are recorded using a system of notation, most commonly algebraic chess notation.[8] Abbreviated (or short) algebraic notation generally records moves in the format "abbreviation of the piece moved file where it moved rank where it moved". The pieces are identified by their initials. In English, these are K (King), Q (Queen), R (Rook), B (Bishop), and N (Knight; N is used to avoid confusion with King). For example, Qg5 means "queen moves to the g-file and the 5th rank" (that is, to the square g5). Chess literature published in other languages may use different initials to indicate the pieces, or Figurine Algebraic Notation may be used to avoid language difficulties. To resolve ambiguities, one more letter or number is added to indicate the file or rank from which the piece moved, e.g. Ngf3 means "knight from the g-file moves to the square f3", and R1e2 means "rook on the first rank moves to e2". The letter P for a pawn is not used, so that e4 means "pawn moves to the square e4".

If the piece makes a capture, "x" is inserted before the destination square. Thus Bxf3 means "bishop captures on f3". When a pawn makes a capture, the file from which the pawn departed is used in place of a piece initial, and ranks may be omitted if unambiguous. For example, exd5 (pawn on the e-file captures the piece on d5) or exd (pawn on the e-file captures a piece somewhere on the d-file). Particularly in Germany, some publications have used ":" rather than "x" to indicate a capture, but this is now rare. Some publications omit the capture symbol altogether, so that exd5 would be rendered simply as "ed".

If a pawn moves to its last rank, achieving promotion, the piece chosen is indicated after the move, for example e1Q or e1=Q. Castling is indicated by the special notations 0-0 for kingside castling and 0-0-0 for queenside castling. An en passant capture is sometimes marked with the notation "e.p." A move that places the opponent's king in check usually has the notation "+" added. (The notation "++" for a double check is considered obsolete.) Checkmate can be indicated by "#". At the end of the game, "10" means "White won", "01" means "Black won", and "" indicates a draw.[9]

Chess moves can be annotated with punctuation marks and other symbols. For example, "!" indicates a good move, "!!" an excellent move, "?" a mistake, "??" a blunder, "!?" an interesting move that may not be best, or "?!" a dubious move not easily refuted.[10]

For example, one variation of a simple trap known as the Scholar's mate (see animated diagram) can be recorded:

The text-based Portable Game Notation (PGN), which is understood by chess software, is based on short form English language algebraic notation.

Until about 1980, the majority of English language chess publications used a form of descriptive notation. In descriptive notation, files are named according to the piece which occupies the back rank at the start of the game, and each square has two different names depending on whether it is from White's or Black's point of view. For example, the square known as "e3" in algebraic notation is "K3" (King's 3rd) from White's point of view, and "K6" (King's 6th) from Black's point of view. When recording captures, the captured piece is named rather than the square on which it is captured (except to resolve ambiguities). The "Scholar's mate" is rendered thus in descriptive notation:

A few players still prefer descriptive notation, but it is no longer recognized by FIDE.

Another system is ICCF numeric notation, recognized by the International Correspondence Chess Federation though its use is in decline. Squares are identified by numeric co-ordinates, for example a1 is "11" and h8 is "88". Moves are described by the "from" and "to" squares, and captures are not indicated. For example, the opening move 1.e4 is rendered as 1.5254. Castling is described by the king's move only, for example 5171 for White castling king's side, 5838 for Black castling queen's side.

Chess strategy consists of setting and achieving long-term positioning advantages during the game for example, where to place different pieces while tactics concentrate on immediate maneuver. These two parts of the chess-playing process cannot be completely separated, because strategic goals are mostly achieved through tactics, while the tactical opportunities are based on the previous strategy of play. A game of chess is normally divided into three phases: opening, typically the first 10 moves, when players move their pieces to useful positions for the coming battle; then middlegame; and last the endgame, when most of the pieces are gone, kings typically take a more active part in the struggle, and pawn promotion is often decisive.

23.Bh5+

In chess, tactics in general concentrate on short-term actions so short-term that they can be calculated in advance by a human player or by a computer. The possible depth of calculation depends on the player's ability. In quiet positions with many possibilities on both sides, a deep calculation is more difficult and may not be practical, while in "tactical" positions with a limited number of forced variations, strong players can calculate long sequences of moves.

Simple one-move or two-move tactical actions threats, exchanges of material, and double attacks can be combined into more complicated combinations, sequences of tactical maneuvers that are often forced from the point of view of one or both players.[12] Theoreticians describe many elementary tactical methods and typical maneuvers; for example, pins, forks, skewers, batteries, discovered attacks (especially discovered checks), zwischenzugs, deflections, decoys, sacrifices, underminings, overloadings, and interferences.[13]

A forced variation that involves a sacrifice and usually results in a tangible gain is called a combination.[12] Brilliant combinations such as those in the Immortal Game are considered beautiful and are admired by chess lovers. A common type of chess exercise, aimed at developing players' skills, is showing players a position where a decisive combination is available and challenging them to find it.[14]

Chess strategy is concerned with evaluation of chess positions and with setting up goals and long-term plans for the future play. During the evaluation, players must take into account numerous factors such as the value of the pieces on the board, control of the center and centralization, the pawn structure, king safety, and the control of key squares or groups of squares (for example, diagonals, open files, and dark or light squares).

Black to move

White to move

...and its pawn skeleton (the "Rauzer formation")

The most basic step in evaluating a position is to count the total value of pieces of both sides.[16] The point values used for this purpose are based on experience; usually pawns are considered worth one point, knights and bishops about three points each, rooks about five points (the value difference between a rook and a bishop or knight being known as the exchange), and queens about nine points. The king is more valuable than all of the other pieces combined, since its checkmate loses the game. But in practical terms, in the endgame the king as a fighting piece is generally more powerful than a bishop or knight but less powerful than a rook.[17] These basic values are then modified by other factors like position of the piece (for example, advanced pawns are usually more valuable than those on their initial squares), coordination between pieces (for example, a pair of bishops usually coordinate better than a bishop and a knight), or the type of position (knights are generally better in closed positions with many pawns while bishops are more powerful in open positions).[18]

Another important factor in the evaluation of chess positions is the pawn structure (sometimes known as the pawn skeleton), or the configuration of pawns on the chessboard.[19] Since pawns are the least mobile of the chess pieces, the pawn structure is relatively static and largely determines the strategic nature of the position. Weaknesses in the pawn structure, such as isolated, doubled, or backward pawns and holes, once created, are often permanent. Care must therefore be taken to avoid these weaknesses unless they are compensated by another valuable asset (for example, by the possibility of developing an attack).[20]

A chess opening is the group of initial moves of a game (the "opening moves"). Recognized sequences of opening moves are referred to as openings and have been given names such as the Ruy Lopez or Sicilian Defence. They are catalogued in reference works such as the Encyclopaedia of Chess Openings. There are dozens of different openings, varying widely in character from quiet positional play (for example, the Rti Opening) to very aggressive (the Latvian Gambit). In some opening lines, the exact sequence considered best for both sides has been worked out to more than 30 moves.[21] Professional players spend years studying openings and continue doing so throughout their careers, as opening theory continues to evolve.

The fundamental strategic aims of most openings are similar:[22]

Most players and theoreticians consider that White, by virtue of the first move, begins the game with a small advantage. This initially gives White the initiative.[23] Black usually strives to neutralize White's advantage and achieve equality, or to develop dynamic counterplay in an unbalanced position.

The middlegame is the part of the game which starts after the opening. There is no clear line between the opening and the middlegame, but typically the middlegame will start when most pieces have been developed. (Similarly, there is no clear transition from the middlegame to the endgame; see start of the endgame.) Because the opening theory has ended, players have to form plans based on the features of the position, and at the same time take into account the tactical possibilities of the position.[24] The middlegame is the phase in which most combinations occur. Combinations are a series of tactical moves executed to achieve some gain. Middlegame combinations are often connected with an attack against the opponent's king. Some typical patterns have their own names; for example, the Boden's Mate or the LaskerBauer combination.[25]

Specific plans or strategic themes will often arise from particular groups of openings which result in a specific type of pawn structure. An example is the minority attack, which is the attack of queenside pawns against an opponent who has more pawns on the queenside. The study of openings is therefore connected to the preparation of plans that are typical of the resulting middlegames.[26]

Another important strategic question in the middlegame is whether and how to reduce material and transition into an endgame (i.e. simplify). Minor material advantages can generally be transformed into victory only in an endgame, and therefore the stronger side must choose an appropriate way to achieve an ending. Not every reduction of material is good for this purpose; for example, if one side keeps a light-squared bishop and the opponent has a dark-squared one, the transformation into a bishops and pawns ending is usually advantageous for the weaker side only, because an endgame with bishops on opposite colors is likely to be a draw, even with an advantage of a pawn, or sometimes even with a two-pawn advantage.[27]

The side having to move is at a disadvantage.

The endgame (also end game or ending) is the stage of the game when there are few pieces left on the board. There are three main strategic differences between earlier stages of the game and the endgame:[28]

Endgames can be classified according to the type of pieces remaining on the board. Basic checkmates are positions in which one side has only a king and the other side has one or two pieces and can checkmate the opposing king, with the pieces working together with their king. For example, king and pawn endgames involve only kings and pawns on one or both sides, and the task of the stronger side is to promote one of the pawns. Other more complicated endings are classified according to pieces on the board other than kings, such as "rook and pawn versus rook" endgames.

Chess is believed to have originated in Eastern India, c. 280550,[29] in the Gupta Empire,[30][31][32][33] where its early form in the 6th century was known as chaturaga (Sanskrit: ), literally four divisions [of the military] infantry, cavalry, elephants, and chariotry, represented by the pieces that would evolve into the modern pawn, knight, bishop, and rook, respectively. Thence it spread eastward and westward along the Silk Road. The earliest evidence of chess is found in the nearby Sassanid Persia around 600, where the game came to be known by the name chatrang. Chatrang was taken up by the Muslim world after the Islamic conquest of Persia (63344), where it was then named shatranj, with the pieces largely retaining their Persian names. In Spanish "shatranj" was rendered as ajedrez ("al-shatranj"), in Portuguese as xadrez, and in Greek as (zatrikion, which comes directly from the Persian chatrang),[34] but in the rest of Europe it was replaced by versions of the Persian shh ("king"), which was familiar as an exclamation and became the English words "check" and "chess".[note 4]

The oldest archaeological artifacts, ivory chess pieces, were excavated in ancient Afrasiab, today's Samarkand, in Uzbekistan, central Asia, and date to about 760, with some of them possibly older. The oldest known chess manual was in Arabic and dates to 840850, written by al-Adli ar-Rumi (800870), a renowned Arab chess player, titled Kitab ash-shatranj (Book of the chess). This is a lost manuscript, but referenced in later works. The eastern migration of chess, into China and Southeast Asia, has even less documentation than its migration west. The first reference to chess, called Xiang Qi, in China comes in the xun gua l (, record of the mysterious and strange) dating to about 800. Alternatively, some contend that chess arose from Chinese chess or one of its predecessors,[35] although this has been contested.[36]

The game reached Western Europe and Russia by at least three routes, the earliest being in the 9th century. By the year 1000, it had spread throughout Europe.[37] Introduced into the Iberian Peninsula by the Moors in the 10th century, it was described in a famous 13th-century manuscript covering shatranj, backgammon, and dice named the Libro de los juegos.

Around 1200, the rules of shatranj started to be modified in southern Europe, and around 1475, several major changes made the game essentially as it is known today.[37] These modern rules for the basic moves had been adopted in Italy and Spain.[38][39] Pawns gained the option of advancing two squares on their first move, while bishops and queens acquired their modern abilities. The queen replaced the earlier vizier chess piece towards the end of the 10th century and by the 15th century had become the most powerful piece;[40] consequently modern chess was referred to as "Queen's Chess" or "Mad Queen Chess".[41] Castling, derived from the 'kings leap' usually in combination with a pawn or rook move to bring the king to safety, was introduced. These new rules quickly spread throughout western Europe. The rules concerning stalemate were finalized in the early 19th century. Also in the 19th century, the convention that White moves first was established (formerly either White or Black could move first). Finally the rules around castling were standardized variations in the castling rules had persisted in Italy until the late 19th century. The resulting standard game is sometimes referred to as Western chess[42] or international chess,[43] particularly in Asia where other games of the chess family such as xiangqi are prevalent. Since the 19th century, the only rule changes have been technical in nature, for example establishing the correct procedure for claiming a draw by repetition.

Writings about the theory of how to play chess began to appear in the 15th century. The Repeticin de Amores y Arte de Ajedrez (Repetition of Love and the Art of Playing Chess) by Spanish churchman Luis Ramirez de Lucena was published in Salamanca in 1497.[39] Lucena and later masters like Portuguese Pedro Damiano, Italians Giovanni Leonardo Di Bona, Giulio Cesare Polerio and Gioachino Greco, and Spanish bishop Ruy Lpez de Segura developed elements of openings and started to analyze simple endgames.

The romantic era was characterized by opening gambits (sacrificing pawns or even pieces), daring attacks, and brazen sacrifices. Many elaborate and beautiful but unsound move sequences called 'combinations' were played by the masters of the time. The game was played more for art than theory. A profound belief that chess merit resided in the players' genius rather than inherent in the position on the board pervaded chess practice.

In the 18th century, the center of European chess life moved from the Southern European countries to France. The two most important French masters were Franois-Andr Danican Philidor, a musician by profession, who discovered the importance of pawns for chess strategy, and later Louis-Charles Mah de La Bourdonnais, who won a famous series of matches with the Irish master Alexander McDonnell in 1834.[44] Centers of chess activity in this period were coffee houses in big European cities like Caf de la Rgence in Paris and Simpson's Divan in London.[45][46]

As the 19th century progressed, chess organization developed quickly. Many chess clubs, chess books, and chess journals appeared. There were correspondence matches between cities; for example, the London Chess Club played against the Edinburgh Chess Club in 1824.[47]Chess problems became a regular part of 19th-century newspapers; Bernhard Horwitz, Josef Kling, and Samuel Loyd composed some of the most influential problems. In 1843, von der Lasa published his and Bilguer's Handbuch des Schachspiels (Handbook of Chess), the first comprehensive manual of chess theory.

The first modern chess tournament was organized by Howard Staunton, a leading English chess player, and was held in London in 1851. It was won by the German Adolf Anderssen, who was hailed as the leading chess master. His brilliant, energetic attacking style was typical for the time.[48][49] Sparkling games like Anderssen's Immortal game and Evergreen game or Morphy's Opera game were regarded as the highest possible summit of the chess art.[50]

Deeper insight into the nature of chess came with two younger players. American Paul Morphy, an extraordinary chess prodigy, won against all important competitors (except Howard Staunton, who refused to play), including Anderssen, during his short chess career between 1857 and 1863. Morphy's success stemmed from a combination of brilliant attacks and sound strategy; he intuitively knew how to prepare attacks.[51]

Prague-born Wilhelm Steinitz beginning in 1873 described how to avoid weaknesses in one's own position and how to create and exploit such weaknesses in the opponent's position.[52] The scientific approach and positional understanding of Steinitz revolutionized the game. Steinitz was the first to break a position down into its components.[53] Before Steinitz, players brought their queen out early, did not completely develop their other pieces, and mounted a quick attack on the opposing king, which either succeeded or failed. The level of defense was poor and players did not form any deep plan.[54] In addition to his theoretical achievements, Steinitz founded an important tradition: his triumph over the leading German master Johannes Zukertort in 1886 is regarded as the first official World Chess Championship. Steinitz lost his crown in 1894 to a much younger player, the German mathematician Emanuel Lasker, who maintained this title for 27 years, the longest tenure of all World Champions.[55]

After the end of the 19th century, the number of master tournaments and matches held annually quickly grew. Some sources state that in 1914 the title of chess Grandmaster was first formally conferred by Tsar Nicholas II of Russia to Lasker, Capablanca, Alekhine, Tarrasch, and Marshall, but this is a disputed claim.[note 5] The tradition of awarding such titles was continued by the World Chess Federation (FIDE), founded in 1924 in Paris. In 1927, the Women's World Chess Championship was established; the first to hold the title was Czech-English master Vera Menchik.[56] It took a prodigy from Cuba, Jos Ral Capablanca (World Champion 19211927), who loved simple positions and endgames, to end the German-speaking dominance in chess; he was undefeated in tournament play for eight years, until 1924. His successor was Russian-French Alexander Alekhine, a strong attacking player who died as the World champion in 1946. He briefly lost the title to Dutch player Max Euwe in 1935 and regained it two years later.[57]

Between the world wars, chess was revolutionized by the new theoretical school of so-called hypermodernists like Aron Nimzowitsch and Richard Rti. They advocated controlling the center of the board with distant pieces rather than with pawns, which invited opponents to occupy the center with pawns, which become objects of attack.[58]

After the death of Alekhine, a new World Champion was sought. FIDE, which has controlled the title since then (except for one interruption), ran a tournament of elite players. The winner of the 1948 tournament, Russian Mikhail Botvinnik, started an era of Soviet dominance in the chess world. Until the end of the Soviet Union, there was only one non-Soviet champion, American Bobby Fischer (champion 19721975).[59] Botvinnik revolutionized opening theory. Previously Black strove for equality, to neutralize White's first-move advantage. As Black, Botvinnik strove for the initiative from the beginning.[60] In the previous informal system of World Championships, the current champion decided which challenger he would play for the title and the challenger was forced to seek sponsors for the match. FIDE set up a new system of qualifying tournaments and matches. The world's strongest players were seeded into Interzonal tournaments, where they were joined by players who had qualified from Zonal tournaments. The leading finishers in these Interzonals would go on the "Candidates" stage, which was initially a tournament, and later a series of knockout matches. The winner of the Candidates would then play the reigning champion for the title. A champion defeated in a match had a right to play a rematch a year later. This system operated on a three-year cycle. Botvinnik participated in championship matches over a period of fifteen years. He won the world championship tournament in 1948 and retained the title in tied matches in 1951 and 1954. In 1957, he lost to Vasily Smyslov, but regained the title in a rematch in 1958. In 1960, he lost the title to the 23-year-old Latvian prodigy Mikhail Tal, an accomplished tactician and attacking player. Botvinnik again regained the title in a rematch in 1961.

Following the 1961 event, FIDE abolished the automatic right of a deposed champion to a rematch, and the next champion, Armenian Tigran Petrosian, a player renowned for his defensive and positional skills, held the title for two cycles, 19631969. His successor, Boris Spassky from Russia (champion 19691972), won games in both positional and sharp tactical style.[61] The next championship, the so-called Match of the Century, saw the first non-Soviet challenger since World War II, American Bobby Fischer, who defeated his Candidates opponents by unheard-of margins and clearly won the world championship match. In 1975, however, Fischer refused to defend his title against Soviet Anatoly Karpov when FIDE did not meet his demands, and Karpov obtained the title by default.[62] Fischer modernized many aspects of chess, especially by extensively preparing openings.[63]

Karpov defended his title twice against Viktor Korchnoi and dominated the 1970s and early 1980s with a string of tournament successes.[64] Karpov's reign finally ended in 1985 at the hands of Garry Kasparov, another Soviet player from Baku, Azerbaijan. Kasparov and Karpov contested five world title matches between 1984 and 1990; Karpov never won his title back.[65] In 1993, Garry Kasparov and Nigel Short broke with FIDE to organize their own match for the title and formed a competing Professional Chess Association (PCA). From then until 2006, there were two simultaneous World Champions and World Championships: the PCA or Classical champion extending the Steinitzian tradition in which the current champion plays a challenger in a series of many games, and the other following FIDE's new format of many players competing in a tournament to determine the champion. Kasparov lost his Classical title in 2000 to Vladimir Kramnik of Russia.[66] The World Chess Championship 2006, in which Kramnik beat the FIDE World Champion Veselin Topalov, reunified the titles and made Kramnik the undisputed World Chess Champion.[67] In September 2007, he lost the title to Viswanathan Anand of India, who won the championship tournament in Mexico City. Anand defended his title in the revenge match of 2008,[68] 2010 and 2012. In 2013, Magnus Carlsen beat Anand in the 2013 World Chess Championship.[69] He defended his title the following year, again against Anand, and is the reigning world champion.

Chess remains a highly popular pastime among the general populace. A 2012 survey found that "chess players now make up one of the largest communities in the world: 605 million adults play chess regularly". Chess is played at least once a year by 12% of British people, 15% of Americans, 23% of Germans, 43% of Russians, and 70% of Indian people.[70]

In the Middle Ages and during the Renaissance, chess was a part of noble culture; it was used to teach war strategy and was dubbed the "King's Game".[71] Gentlemen are "to be meanly seene in the play at Chestes", says the overview at the beginning of Baldassare Castiglione's The Book of the Courtier (1528, English 1561 by Sir Thomas Hoby), but chess should not be a gentleman's main passion. Castiglione explains it further:

And what say you to the game at chestes? It is truely an honest kynde of enterteynmente and wittie, quoth Syr Friderick. But me think it hath a fault, whiche is, that a man may be to couning at it, for who ever will be excellent in the playe of chestes, I beleave he must beestowe much tyme about it, and applie it with so much study, that a man may assoone learne some noble scyence, or compase any other matter of importaunce, and yet in the ende in beestowing all that laboure, he knoweth no more but a game. Therfore in this I beleave there happeneth a very rare thing, namely, that the meane is more commendable, then the excellency.[72]

Many of the elaborate chess sets used by the aristocracy have been lost, but others partially survive, such as the Lewis chessmen.

Chess was often used as a basis of sermons on morality. An example is Liber de moribus hominum et officiis nobilium sive super ludo scacchorum ('Book of the customs of men and the duties of nobles or the Book of Chess'), written by an Italian Dominican monk Jacobus de Cessolis c. 1300. This book was one of the most popular of the Middle Ages.[73] The work was translated into many other languages (the first printed edition was published at Utrecht in 1473) and was the basis for William Caxton's The Game and Playe of the Chesse (1474), one of the first books printed in English.[74] Different chess pieces were used as metaphors for different classes of people, and human duties were derived from the rules of the game or from visual properties of the chess pieces:[75]

The knyght ought to be made alle armed upon an hors in suche wyse that he haue an helme on his heed and a spere in his ryght hande/ and coueryd wyth his sheld/ a swerde and a mace on his lyft syde/ Cladd wyth an hawberk and plates to fore his breste/ legge harnoys on his legges/ Spores on his heelis on his handes his gauntelettes/ his hors well broken and taught and apte to bataylle and couerid with his armes/ whan the knyghtes ben maad they ben bayned or bathed/ that is the signe that they shold lede a newe lyf and newe maners/ also they wake alle the nyght in prayers and orysons vnto god that he wylle gyue hem grace that they may gete that thynge that they may not gete by nature/ The kynge or prynce gyrdeth a boute them a swerde in signe/ that they shold abyde and kepe hym of whom they take theyr dispenses and dignyte.[76]

Known in the circles of clerics, students, and merchants, chess entered into the popular culture of Middle Ages. An example is the 209th song of Carmina Burana from the 13th century, which starts with the names of chess pieces, Roch, pedites, regina...[77]

During the Age of Enlightenment, chess was viewed as a means of self-improvement. Benjamin Franklin, in his article "The Morals of Chess" (1750), wrote:

The Game of Chess is not merely an idle amusement; several very valuable qualities of the mind, useful in the course of human life, are to be acquired and strengthened by it, so as to become habits ready on all occasions; for life is a kind of Chess, in which we have often points to gain, and competitors or adversaries to contend with, and in which there is a vast variety of good and ill events, that are, in some degree, the effect of prudence, or the want of it. By playing at Chess then, we may learn:

I. Foresight, which looks a little into futurity, and considers the consequences that may attend an action [...]

II. Circumspection, which surveys the whole Chess-board, or scene of action: the relation of the several Pieces, and their situations [...]

III. Caution, not to make our moves too hastily [...][78]

With these or similar views, chess is taught to children in schools around the world today. Many schools host chess clubs, and there are many scholastic tournaments specifically for children. Tournaments are held regularly in many countries, hosted by organizations such as the United States Chess Federation and the National Scholastic Chess Foundation.[79]

Chess is often depicted in the arts; significant works where chess plays a key role range from Thomas Middleton's A Game at Chess to Through the Looking-Glass by Lewis Carroll, to Vladimir Nabokov's The Defense, to The Royal Game by Stefan Zweig. Chess is featured in films like Ingmar Bergman's The Seventh Seal and Satyajit Ray's The Chess Players.

Chess is also present in contemporary popular culture. For example, the characters in Star Trek play a futuristic version of the game called "Tri-Dimensional Chess". "Wizard's Chess" is featured in J. K. Rowling's Harry Potter plays. The hero of Searching for Bobby Fischer struggles against adopting the aggressive and misanthropic views of a world chess champion.[80] Chess is used as the core theme in the musical Chess by Tim Rice, Bjrn Ulvaeus, and Benny Andersson. The thriller film Knight Moves is about a chess grandmaster who is accused of being a serial killer. Pawn Sacrifice, starring Tobey Maguire as Bobby Fischer and Liev Schreiber as Boris Spassky, depicts the drama surrounding the 1972 World Chess Championship in Iceland during the Cold War.[81]

Chess composition is the art of creating chess problems (also called chess compositions). The creator is known as a chess composer.[82] There are many types of chess problems; the two most important are:

Chess composition is a distinct branch of chess sport, and tournaments exist for both the composition and solving of chess problems.[85]

This is one of the most famous chess studies; it was published by Richard Rti 4 December 1921. It seems impossible to catch the advanced black pawn, while the black king can easily stop the white pawn. The solution is a diagonal advance, which brings the king to both pawns simultaneously:

Contemporary chess is an organized sport with structured international and national leagues, tournaments, and congresses. Chess's international governing body is FIDE (Fdration Internationale des checs). Most countries have a national chess organization as well (such as the US Chess Federation and English Chess Federation) which in turn is a member of FIDE. FIDE is a member of the International Olympic Committee,[87] but the game of chess has never been part of the Olympic Games; chess does have its own Olympiad, held every two years as a team event.

The current World Chess Champion is Magnus Carlsen of Norway.[88] The reigning Women's World Champion is Hou Yifan from China.[89] The world's highest rated female player, Judit Polgr, has never participated in the Women's World Chess Championship, instead preferring to compete with the leading men and maintaining a ranking among the top male players.[90]

Other competitions for individuals include the World Junior Chess Championship, the European Individual Chess Championship, and the National Chess Championships. Invitation-only tournaments regularly attract the world's strongest players. Examples include Spain's Linares event, Monte Carlo's Melody Amber tournament, the Dortmund Sparkassen meeting, Sofia's M-tel Masters, and Wijk aan Zee's Tata Steel tournament.

Regular team chess events include the Chess Olympiad and the European Team Chess Championship. The World Chess Solving Championship and World Correspondence Chess Championships include both team and individual events.

Besides these prestigious competitions, there are thousands of other chess tournaments, matches, and festivals held around the world every year catering to players of all levels. Chess is promoted as a "mind sport" by the Mind Sports Organisation, alongside other mental-skill games such as Contract Bridge, Go, and Scrabble.

The best players can be awarded specific lifetime titles by the world chess organization FIDE:[91]

All the titles are open to men and women. Separate women-only titles, such as Woman Grandmaster (WGM), are available. Beginning with Nona Gaprindashvili in 1978, a number of women have earned the GM title, and most of the top ten women in 2006 hold the unrestricted GM title.[note 6]

As of August 2011, there are 1363 active grandmasters and 3153 international masters in the world. Top three countries with the largest numbers of grandmasters are Russia, Ukraine, and Germany, with 208, 78, and 76. The country with most grandmasters per capita is Iceland, with 11 GMs and 13 IMs among the population of 310,000.[92]

International titles are awarded to composers and solvers of chess problems and to correspondence chess players (by the International Correspondence Chess Federation). National chess organizations may also award titles, usually to the advanced players still under the level needed for international titles; an example is the Chess expert title used in the United States.

In order to rank players, FIDE, ICCF, and national chess organizations use the Elo rating system developed by Arpad Elo. Elo is a statistical system based on the assumption that the chess performance of each player in his or her games is a random variable. Arpad Elo thought of a player's true skill as the average of that player's performance random variable, and showed how to estimate the average from results of player's games. The US Chess Federation implemented Elo's suggestions in 1960, and the system quickly gained recognition as being both fairer and more accurate than older systems; it was adopted by FIDE in 1970.[note 7] The highest FIDE rating of all time, 2881, was achieved by Magnus Carlsen on the March 2014 FIDE rating list.[93]

Chess has a very extensive literature. In 1913, the chess historian H. J. R. Murray estimated the total number of books, magazines, and chess columns in newspapers to be about 5,000.[94][95]B.H. Wood estimated the number, as of 1949, to be about 20,000.[95]David Hooper and Kenneth Whyld write that, "Since then there has been a steady increase year by year of the number of new chess publications. No one knows how many have been printed."[95] There are two significant public chess libraries: the John G. White Chess and Checkers Collection at Cleveland Public Library, with over 32,000 chess books and over 6,000 bound volumes of chess periodicals;[96] and the Chess & Draughts collection at the National Library of the Netherlands, with about 30,000 books.[97]Grandmaster Lothar Schmid owned the world's largest private collection of chess books and memorabilia.[98] David DeLucia's chess library contains 7,000 to 8,000 chess books, a similar number of autographs (letters, score sheets, manuscripts), and about 1,000 items of "ephemera".[99]Dirk Jan ten Geuzendam opines that DeLucia's collection "is arguably the finest chess collection in the world".[100]

The game structure and nature of chess are related to several branches of mathematics. Many combinatorical and topological problems connected to chess have been known of for hundreds of years.

The number of legal positions in chess is estimated to be about 1043, and is provably less than 1047,[101][102] with a game-tree complexity of approximately 10123. The game-tree complexity of chess was first calculated by Claude Shannon as 10120, a number known as the Shannon number.[103] Typically an average position has thirty to forty possible moves, but there may be as few as zero (in the case of checkmate or stalemate) or as many as 218.[104]

Chess has inspired many combinatorial puzzles, such as the knight's tour and the eight queens puzzle.

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