1a war game in which blocks representing armies or other military units are moved about on maps.
2a form of chess in which each player has a separate board and can only infer the position of the opponent’s forces from limited information given by an umpire.
Origin:
late 19th century: from German, from Krieg 'war' + Spiel 'game'
kriegspiel in other Oxford dictionaries
Definition of kriegspiel in the US English dictionary