Pieces: There is a 'transportation grid' which runs along the 5th (e) and 12th (l) files, and along the 3rd and 7th ranks.

Soldier (P): Steps 1 sideways, forward-diagonal, or forward. Also has a range 2 gun capture. Promotes to Avatar (Q) if it reaches opponent's 1st rank. No other piece in Operational Chess promotes.
Spy (I): Steps 1 in any direction. These pieces start the game on the opponent's side of the board.
Artillery (C): As a cannon - pao - from chinese chess, with diagonal - vao - capability built in.
Tank (R): As a standard rook-chariot, or can make a range 4 gun capture. This gun capture includes diagonal capture.
Helicopter (H): Leaps any combination of 4, or can make a range 4 gun capture as the Tank.
Cavalry (B): As a standard bishop, or can make range 4 gun capture as the Tank, including orthogonal capture.
Missile (M): Can move-capture to any square on the board of its same color.
Bomber (O): Same as Missile, but on the opposite color. Cannot attack opponent's Bomber or Fighters.
General (G): Leaps any combination of 3 squares.
Fighter (X): Attacks any square of the same color that is within range 3.
Mogul (V): Inspired by the Vizier piece, it can step-leap up to 4 orthogonally.
Statesman (F): Inspired by Ferz, it can step-leap up to 4 diagonally.
Avatar (Q): Exactly as a queen in standard chess.
Train (E): Trains represent a player's logistical infrastructure. The object of the game is to capture all 10 of your opponent's train pieces. The train moves-captures like a rook or a bishop, but only along the single orthogonal or diagonal line indicated by the piece. In addition, every one of this piece type, regardless of its indicated direction, can also move as a rook along any of the 'transportation grid' ranks or files. In order to differentiate them from other pieces, The train pieces have a gold background.

There is no turn limit in Operational Chess. Instead, once one player captures the last Train piece of his opponent, the game ends then and there.
Otherwise it is played as normal chess, one move per side per turn, with Blue going first and Red going second.
If both players agree to a stalemate before either can reach victory, that is ok as well.