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The Shannon number, named after the American mathematician Claude Shannon, is a conservative lower bound of the game-tree complexity of chess of 10 120, based on an average of about 10 3 possibilities for a pair of moves consisting of a move for White followed by a move for Black, and a typical game lasting about 40 such pairs of moves.
In ICCF numeric notation, each square of the chessboard has a two-digit designation. The first digit is the number of the file; files are numbered 1 to 8 from left to right from White's point of view. The second digit is the rank; ranks are numbered 1 to 8 from nearest to farthest from White's point of view. Each move is denoted by either four ...
Lichess (/ ˈ l iː tʃ ɛ s /; LEE-ches) [3] [4] is a free and open-source Internet chess server run by a non-profit organization of the same name. Users of the site can play online chess anonymously and optionally register an account to play rated games. Lichess is ad-free and all the features are available for free, as the site is funded by ...
Chess. Play free chess online against the computer or challenge another player to a multiplayer board game. With rated play, chat, tutorials, and computer opponents from beginner to expert! By ...
The Najdorf Variation[ 1] ( / ˈnaɪdɔːrf / NY-dorf) of the Sicilian Defence is one of the most popular, reputable, and deeply studied of all chess openings. [ 2][ 3] Modern Chess Openings calls it the "Cadillac" or "Rolls-Royce" of chess openings. [ 4] The opening is named after the Polish-Argentine grandmaster Miguel Najdorf, although he ...
A total of seven chess players have been the chess world number one on the official FIDE rating list since it was first published in July 1971. [ 1] The first world number one, in July 1971, was Bobby Fischer. In January 1976 Anatoly Karpov became the highest-rated player on the FIDE list, FIDE having dropped Fischer (whose rating was higher ...
This is a list of chess openings, organised by the Encyclopaedia of Chess Openings (ECO) code classification system.The chess openings are categorised into five broad areas ("A" through "E"), with each of those broken up into one hundred subcategories ("00" through "99").
Named after. Catalonia. Parent. Indian Defence. The Catalan Opening is a chess opening where White plays d4 and c4 and fianchettoes the white bishop on g2. A common opening sequence is 1.d4 Nf6 2.c4 e6 3.g3, although various other openings can transpose into the Catalan. The Encyclopaedia of Chess Openings ( ECO) lists codes E01–E09 for lines ...
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