Suicide chess rules. In Rettah chess (one rettah; pawns move only one step forward) and Double Rettah chess (two rettahs; no forced capture; win by checkmating a rettah), play is on a regular 8×8 board. Sample game Decimal Rettah, "a game of assault and sacrifice", received high praise from Boyer who published the following sample game [the game uses an alternate initial setup NBKQRRQKBN and incorrect interpretation of the capture rule, requiring that only a rettah may capture its attacker]: 1.c3 f6 2.Qb3 Rf8 3.Qxb9+ Kxb9 4.Bf5+ Kxf5 5.e4+ Kxe4 6.f3+ Kxf3 7.Rxf3 Qc6 8.Rh3 Qxc3+ 9.Kxc3 Rc8+ 10.Kxc8 dxc8 11.Qc5 e7 12.Rxh9+ Kxh9 13.Qh5+ Kxh5 14.Ni3+ Kxi3 15.Kxi3 1–0 Identific In this variant, the identity of chess pieces becomes known as play proceeds. Game rules Players first place their 12 counters (draughtsmen) on any squares of their choosing on their own half of the board. (Either White places all his counters first, followed by Black; or one per turn if the players prefer.) After all counters have been placed, White moves any one of his counters as a regular chess piece of his choosing, then immediately replaces that counter with the corresponding chess piece. Black does similarly on his turn. These "moves of identification" obey the following rules: After each player has identified one chess piece, on subsequent turns players may choose to identify an additional piece from those still in-hand, or move one of their chess pieces already on the board. Chess pieces move, capture, give check/checkmate as normal, and may capture enemy counters. A player's fourth identified piece must be his king. (Or the players can agree on a different schedule, for example, the sixth identified piece.) Players might also want to prevent the early identification of queens, for example, by requiring at least five identifications, or by limiting identification of queen to a player's last-remaining counter. Synchronistic chess "A variant designed, part tongue-in-cheek, to achieve absolute equality." "[...] to eliminate altogether that inequality between White and Black, by the simple idea that White and Black shall always play their corresponding moves simultaneously!" Game rules For each turn players decide their moves, write them down secretly, then disclose them. They adjust the position accordingly, using the following rules of resolution when needed: In Synchronistic Chess, simultaneous checkmate is possible. Damate Also known as Damate Game, the game is a synthesis between draughts and chess. Game rules A