What is Kriegspiel?

Kriegspiel definition and meaning on Dictionary terms:
(sometimes initial capital letter) a game using small figures and counters that represent troops, ships, etc., played on a map or miniature battlefield, developed for teaching military tactics to officers.
a form of chess in which both players see only their own pieces on a board in front of them and must remember the opponent’s moves as told to them by a referee who maintains a third board on which the play of both players is shown.