In the classic board game Stratego, each player has 40 pieces that represent different ranks in an army. The SPY is a 3-letter piece that can move one space in any direction and can capture any piece except the BOMB and the FLAG. The BOMB is a 4-letter piece that cannot move and can only be captured by a Miner. The FLAG is a 4-letter piece that cannot move and is the most important piece in the game; if it is captured, the game is over.