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A player can either move one piece twice (this is the source of the famous trap in the "balanced" version of the game where White opening with pawn-two appears to be trivially busted by an unprincipled defense with the pawn on an adjacent file) or move two different pieces on their turn.
Marseillais chess (or Two-move chess): After the first turn of the game by White being a single move, each player moves twice per turn. Monster chess (or Super King ): White has the king and four pawns (c2-f2) against the entire black army but may make two successive moves per turn.
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.
Generally, because basic Dark chess rules are universal with respect to its "parent" classical variant, any 2-player chess variant may be played "in dark". SchemingMind provides some of the variations. Dark chess (checkmate) – standard rules of check apply (a player is notified when its king is in check, and the king cannot move into check).
The word "turn" can be a problem since it means different things in different traditions. For example, in standard chess terminology, one move consists of a turn by each player; therefore a ply in chess is a half-move. Thus, after 20 moves in a chess game, 40 plies have been completed—20 by white and 20 by black.
Email play has gradually declined in popularity due to issues such as email viruses, opponents' claims of not receiving moves, and similar impediments to the point email play has arguably been superseded by server-based correspondence chess, where usually the interface to a chess server is a web-based interface.
Play free chess online against the computer or challenge another player to a multiplayer board game. With rated play, chat, tutorials, and opponents of all levels!
After the key, after tries and set play each constitutes a phase of play. A problem with set play is said to have two phases (the set play being one phase, the post-key play being another); a problem with three tries would be a four-phase problem (each try being one phase, with the post-key play the fourth). Plays in different phases sometimes ...