Monochromatic chess d2 and f2, the white king can move from e1 only with castling and then g1–h2–g3–... so the pawn on g3 cannot be white. In Bichromatic chess, the opposite restrictions apply. A piece on a white square must move to a black square and vice versa. Hence pawns cannot capture (or advance two squares) and bishops cannot move. Also, castling and "en passant" are impossible, and queens behave like rooks. Monochromatic chess Monochromatic chess is a chess variant with unknown origin. The initial board position and all rules are the same as in regular chess, except that pieces that begin
Touch-move rule violation must do so before making a move. A player who wants to adjust a piece on its square without being required to move it can announce the French "j’adoube" ("I adjust") before touching the piece . While "j'adoube" is internationally understood, a local language equivalent such as "adjusting" is usually acceptable. A player may not touch the pieces on the board during the opponent's turn. There is a separate rule that a player who lets go of a piece after making a legal move cannot retract the move. If a player having the move deliberately touches one of their