Kriegspiel (chess) follows. The game is played with three boards, one for each player; the third is for the umpire (and spectators). Each opponent knows the exact position of just their pieces, and does not know where the opponent's pieces are (but can keep track of how many there are). Only the umpire knows the position of the game. The game proceeds in the following way: The umpire announces: Pawn promotions are not announced. Kriegspiel is sometimes used in chess problems. In these, usual variations introduced by different black moves are replaced by variations introduced by different announcements. An example of a
Fast chess may serve to illustrate this: Fast chess Fast chess (also known as speed chess) is a type of chess in which each player is given less time to consider their moves than normal tournament time controls allow. The rules specify a cumulative total time for moves for each side. In a fast chess game, each player will have less than the usual 60 minutes at their disposal, based on a 60-move game, and sometimes considerably less time. Fast chess is further subdivided, by decreasing time controls, into rapid chess, blitz chess, and bullet chess. Armageddon chess is a particular variation