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
Four-player chess Four-player chess Four-player chess (also known as Four-handed, Four-man, or Four-way chess) is a family of chess variants typically played with four people. A special board made of standard 8×8 squares with an additional 3 rows of 8 cells extending from each side is common. Four sets of differently colored pieces are needed to play these variants. Four-player chess follows the same basic rules as regular chess. There are many different rule variations; most variants, however, share the same board and similar piece setup. Gameplay can be in teams, but it can also be a free-for-all, with each player out