Kriegspiel

Kriegspiel is a variant of Chess sporting incomplete information. Normal chess rules apply, with each player controlling 16 pieces of an 8x8 tile board. Where normally each player can see their opponent's move, here the players don't see the moves made by their opponent. The computer arbitrates the game since neither player is now aware whether a move they make is actually valid. If a player tries to make a move that isn't valid (for example because it would put them in a 'check' position) both players are informed that an invalid move was attempted. When a piece is taken the capturing player is not told what type of piece it was. Players can ask the game if any of their pawns are in a position that they can capture another piece. If possible they are then forced to make such a move.