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  2. Chess annotation symbols - Wikipedia

    en.wikipedia.org/wiki/Chess_annotation_symbols

    On certain Internet chess servers, such as Chess.com and Lichess, this kind of move is marked as an "inaccuracy", denoting a weak move, appearing more regularly than with most annotators. A sacrifice leading to a dangerous attack that the opponent should be able to defend against if they play well may receive a "?!".

  3. Glossary of chess problems - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_chess_problems

    For example, in a directmate, set play consists of lines of play starting with a Black move (rather than a White move). When set play exists, the key move may be something that does not change the set play lines, in which case the problem is a complete block, or the lines in the set play may change, in which case the problem is a mutate.

  4. Triangulation (chess) - Wikipedia

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

    Triangulation is a tactic used in chess to put one's opponent in zugzwang (a position in which it is a disadvantage to move). Triangulation is also called losing a tempo or losing a move.

  5. Threefold repetition - Wikipedia

    en.wikipedia.org/wiki/Threefold_repetition

    The rule is also known as repetition of position and, in the USCF rules, as triple occurrence of position. [1] Two positions are by definition "the same" if the same types of pieces occupy the same squares, the same player has the move, the remaining castling rights are the same and the possibility to capture en passant is the same.

  6. 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 ...

  7. Plaskett's Puzzle - Wikipedia

    en.wikipedia.org/wiki/Plaskett's_Puzzle

    Plaskett's Puzzle is a chess endgame study created by the Dutch endgame composer Gijs van Breukelen (February 27, 1946 – December 21, 2022) around 1970, although not published at the time. Van Breukelen published the puzzle in 1990 in the Netherlands chess magazine Schakend Nederland .

  8. Chess theory - Wikipedia

    en.wikipedia.org/wiki/Chess_theory

    Chess initial position. The game of chess is commonly divided into three phases: the opening, middlegame, and endgame. [1] There is a large body of theory regarding how the game should be played in each of these phases, especially the opening and endgame.

  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.