Two Kriegspiel problems by Henk Swart . Rules Kriegspiel is a battle between two players. However, a third person is necessary to act as a referee. One needs three boards for the game. Only the referee knows exactly the real position of both sets of pieces.
Players move turn-wise, just as in normal chess.
Each turn, a player attempts a move. When this move is legal, the referee announces that the player has moved, and the turn is done. When the move is not legal, the referee also announces that the player attempted an illegal move, and the player must make a new attempt to move, until he makes a legal move. All announcements by the referee are heard by both players. When a piece captures another piece, the referee announces this, and also the field where the capture has taken place.