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  2. Fifty-move rule - Wikipedia

    en.wikipedia.org/wiki/Fifty-move_rule

    Tablebases do not consider the 50- or 75-move rules, so a position that is a theoretical win according to the tablebases may be a draw in over-the-board chess. Such a position is sometimes termed a "cursed win" (where mate can be forced, but it runs afoul of the 50-move rule), or a "blessed loss" from the perspective of the other player.

  3. Rules of chess - Wikipedia

    en.wikipedia.org/wiki/Rules_of_chess

    The rules of chess (also known as the laws of chess) govern the play of the game of chess. Chess is a two-player abstract strategy board game. Each player controls sixteen pieces of six types on a chessboard. Each type of piece moves in a distinct way.

  4. Chess - Wikipedia

    en.wikipedia.org/wiki/Chess

    Chess is a board game for two players. ... Fifty-move rule: If during the previous 50 moves no pawn has been moved and no capture has been made, ...

  5. Endgame tablebase - Wikipedia

    en.wikipedia.org/wiki/Endgame_tablebase

    Competitive players must know that some tablebases ignore the fifty-move rule. According to that rule, if fifty moves have passed without a capture or a pawn move, either player may claim a draw. FIDE changed the rules several times, starting in 1974, to allow one hundred moves for endgames where fifty moves were insufficient to win. In 1988 ...

  6. Draw (chess) - Wikipedia

    en.wikipedia.org/wiki/Draw_(chess)

    In chess, there are a number of ways that a game can end in a draw, neither player winning.Draws are codified by various rules of chess including stalemate (when the player to move is not in check but has no legal move), threefold repetition (when the same position occurs three times with the same player to move), and the fifty-move rule (when the last fifty successive moves made by both ...

  7. Queen versus rook endgame - Wikipedia

    en.wikipedia.org/wiki/Queen_versus_rook_endgame

    Browne could have won the rook or checkmated in 31 moves with perfect play. After 45 moves, Browne realized that he would not be able to win within 50 moves, according to the fifty-move rule. [5] Browne studied the endgame and, later in the month, played another game from a different starting position.

  8. Shannon number - Wikipedia

    en.wikipedia.org/wiki/Shannon_number

    Claude Shannon. 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.

  9. Solving chess - Wikipedia

    en.wikipedia.org/wiki/Solving_chess

    A variant first described by Claude Shannon provides an argument about the game-theoretic value of chess: he proposes allowing the move of “pass”. In this variant, it is provable with a strategy stealing argument that the first player has at least a draw thus: if the first player has a winning move in the initial position, let him play it, else pass.

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