Stratego (1946)

On a board of 10×10 squares each player controls 40 pieces representing individual officer ranks in an army. The objective of the game is to find and capture the opponent's Flag, or to capture so many enemy pieces that the opponent cannot make any further moves. Unlike chess, Stratego is a game of incomplete information. In addition to calculated sequences of moves, this gives rise to aspects of battle psychology like concealment, bluffing, lying in wait and guessing. (wikipedia.org)