Gunjin Shōgi

Gunjin Shōgi, also called Japanese Military Chess or Marching Chess, is a two-player Japanese board game intended for children. Its pentagonal pieces resemble those of shogi, but the aim is to capture the opponent's flag, which makes it closer in play to Stratego and its predecessor L'Attaque. Each side starts with an equal set of pieces of differing strengths, with identities hidden from the opponent, so the game is one of imperfect information in which players deduce what the hidden pieces are. A third-party referee usually judges each attack. Pieces carry military ranks, and the spy alone can defeat the general, while mines defeat every attacker except the engineer. Versions differ in piece count and board size, and later sets add aircraft, tanks, missiles and an atomic bomb. It has been sold and played since at least 1895, though its inventor and date of invention are unknown.