IntroductionTrappist-1 (also called "Chess on an Infinite Plane with Huygens Option") is a chess variant played on a chessboard of infinite size. The game includes two huygens for each color. Huygens can jump 5, 7, 11 and other prime numbers of squares in orthogonal directions (i.e. 5, 7, 11, 13, 17,...). Since it jumps in prime numbers, other jumpers such as the knight and hawk, need to make an inefficient maneuver when pursuing a huygens, causing wasted moves.
PiecesBlack and White each have the following pieces: 1 king, 1 queen, 2 chancellors, 2 rooks, 4 bishops, 4 knights, 2 guards, 2 hawks, 2 huygens, and 26 pawns.
Hawk (Ha) - Leaps exactly 2 or 3 squares in any orthogonal or diagonal direction. The leaping move means it can jump over other pieces.
Guard (G) - Moves and captures the same as a king but is not affected by check.
Pawns play the same and promote at the same rank as in classical chess. (Using the board coordinates shown in the diagram, white pawnsÂ promote at rank 16, andÂ blackÂ pawns promote at rank 9). Pawns can promote to chancellor, hawk, huygens, or guard, in addition to queen, rook, bishop, or knight. Pawns may capture en passant with the same rules as in classical chess.
RulesThere is no castling.
NotesA description of the huygen chess piece is also available here:
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By V. Reinhart.
Web page created: 2017-02-28. Web page last updated: 2017-02-28