What is "kriegspiel"

war games played with pieces on maps, 1811 as a German word in English, from German Kriegsspiel, literally "war game," from Krieg "war," from Middle High German kriec, "combat," mostly "exertion, effort; opposition, enmity, resistance," from Old High German chreg "stubbornness, defiance, obstinacy," perhaps from PIE *gwere- (2) "heavy" (see grave (adj.)) or cognate with Greek hybris "violence" (see hubris; also see war (n.)). For second element, see spiel (n.). Introduced 1870s as officer training in British army.

n. 1 A boardgame used to train military tactics and strategy 2 A variant of chess in which players cannot see their opponent's pieces

Kriegspiel (German for war game) is a chess variant invented by Henry Michael Temple in 1899 and based upon the original Kriegsspiel developed by Georg von Reiswitz in 1812. In this game each player can see their own pieces, but not those of their opponent. For this reason, it is necessary to have a third person (or computer) act as a referee, with full information about the progress of the game. When it is a player's turn he or she will attempt a move, which the referee will declare to be 'legal' or 'illegal'. If the move is illegal, the player tries again; if it is legal, that move stands. Each player is given information about checks and captures. They may also ask the referee if there are any legal captures with a pawn. Since the position of the opponent's pieces is unknown, Kriegspiel is not a game with perfect information. Chess Kriegspiel derives from a war game which was used in 19th century Germany to train military officers. As each player cannot see his or her opponents pieces, the game is sometimes referred to as blind chess.