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
Losing Chess most widely played (main variant) is described in "Popular Chess Variants" by D. B. Pritchard. The rules are the same as those for standard chess, except for the following special rules: A player wins by losing all their pieces, or being stalemated. Apart from move repetition, draw by agreement, and the fifty-move rule, the game is also drawn when a win is impossible (for example, when the only pieces remaining are ). Because of the forced capture rule, Losing Chess games often involve long sequences of captures by one player. This means that a minor mistake can doom a game.