During his work at the Operations Research Office, the physicist George Gamow invented a simple war game to be played by analysts. The game is played with three identical boards, one for each of the players and one for a referee.
The board … represents a tank battlefield by a lattice of hexagons, … some of which are hatched to represent wooded areas of low visibility. The white hexagons represent open fields, and the size of a hexagon represents the “radius of action” of a tank in battle.
Each player starts with ten markers representing tanks at his back line, and “a move” consists in displacing any number of tanks into any of the adjacent hexagons. Each player sees his board only and must infer from the play where his opponent’s tanks are located.
(from the rules)
Get the full game: https://grognard.com/download/games/board/tankgame.pdf