The rules of normal chess apply unless otherwise noted. Pawns do not have an initial two square move. Castling is not allowed. A white pawn that reaches c8, e8, h5 or h3 may promote to a Bishop or Knight. A white pawn that reaches d8 or h4 may only promote to a Knight.
Similar rules apply for black.
See the following diagram. Note, a player may still win by checkmating. Promotion squares for white are indicated on edge of board. Notes A design limitation of this game was to be able to use a normal chess baord and pieces, with no extra equipment. A Knight is limited to moving to either light or dark squares.