same two spaces for more than three consecutive turns (two square rule), nor can a piece endlessly chase a piece it has no hope of capturing (more square rule). When a player wants to attack, they "strike" by touching an opposing piece with their piece or moves their piece onto the square it occupies. Both players then reveal their piece's rank; the weaker piece (see exceptions below) is removed from the board. If the engaging pieces are of equal rank, both are removed. A piece may not move onto a square already occupied unless it attacks. Two pieces have special attack powers. One special piece is the Bomb which only Miners can defuse. It immediately eliminates any other piece striking it, without itself being destroyed. Each player also has one Spy, which succeeds only if it attacks the Marshal or the Flag. If the Spy attacks any other piece, or is attacked by any piece (including the Marshal), the Spy is defeated. The original rules contained a provision that following a strike, the winning piece immediately occupies the space vacated by the losing piece. Recording the game Competitive play does not include recording the game, unlike chess. The game is fast-paced, no standard notation exists, and players keep their setups secret, so recording games is impractical. However, digital interfaces such as web-based gaming interfaces may have a facility for recording, replaying and downloading the game. Those interfaces use an algebraic-style notation that numbers the rows ('ranks') 1 to 10 from bottom to top and the columns ('files') A to J from left to right. Alternately, a few interfaces designate the files as A to K, omitting 'I'. Moves are recorded as source square followed by destination square separated by a "-" (move) or "x" (strike). Revealed pieces on strikes precede the square designation, and may be by either rank name or rank number for brevity, for example "major B2xcaptain B3". The bottom half of the board is by default considered to be the 'red' side, and the top half the 'blue' side. Strategy Unlike chess, Stratego is a game of incomplete information. In addition to calculated sequences of moves, this gives rise to aspects of battle psychology such as concealment, bluffing, lying in wait and guessing. Pieces Classic pieces There are seven immobile pieces – six Bombs and one Flag – and 33 mobile pieces per player. They can move