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  2. Threefold repetition - Wikipedia

    en.wikipedia.org/wiki/Threefold_repetition

    In chess, the threefold repetition rule states that a player may claim a draw if the same position occurs three times during the game. The rule is also known as repetition of position and, in the USCF rules, as triple occurrence of position . [ 1 ]

  3. 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 ...

  4. List of chess variants - Wikipedia

    en.wikipedia.org/wiki/List_of_chess_variants

    No Stress Chess: Marketed for teaching beginners, the piece(s) a player is able to move are determined by drawing from a deck of cards, with each card providing the rules for how the piece may move. Castling and en passant are disallowed. [105] Panic Chess: Player selects a piece to move, but the target square is randomized from all possible ...

  5. Berlin Defence - Wikipedia

    en.wikipedia.org/wiki/Berlin_Defence

    The Berlin Defence is a chess opening that begins with the moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6. The opening is a variation of the Ruy Lopez and is assigned codes C65–C67 in the Encyclopaedia of Chess Openings. [1] The code C65 covers White moves other than 4.0-0, such as 4.d3 (4.Nc3 is considered a variation of the Four Knights Game). The ...

  6. Chess strategy - Wikipedia

    en.wikipedia.org/wiki/Chess_strategy

    Chess strategy is the aspect of chess play concerned with evaluation of chess positions and setting goals and long-term plans for future play. While evaluating a position strategically, a player must take into account such factors as the relative value of the pieces on the board, pawn structure, king safety, position of pieces, and control of key squares and groups of squares (e.g. diagonals ...

  7. Three-player chess - Wikipedia

    en.wikipedia.org/wiki/Three-player_chess

    Three-player chess (also known as three-handed, three-man, or three-way chess) is a family of chess variants specially designed for three players. [1] Many variations of three-player chess have been devised. They usually use a non-standard board, for example, a hexagonal or three-sided board that connects the center cells in a special way. The ...

  8. 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.

  9. Zermelo's theorem (game theory) - Wikipedia

    en.wikipedia.org/wiki/Zermelo's_theorem_(game...

    Contrary to the popular belief, chess is not a finite game without at least one of the fifty move rule or threefold repetition rule. Strictly speaking, chess is an infinite game therefore backward induction does not provide the minmax theorem in this game. [6] Backward induction is a process of reasoning backward in time.

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