Touch-move rule the player touches his rook at the same time as touching the king, he must castle with that rook if it is legal to do so. If the player completes a two-square king move without touching a rook, the player must move the correct rook accordingly if castling on that side is legal. Otherwise, the move must be withdrawn and another king move made. When a pawn is moved to its eighth , once the player takes his hand off the pawn, a different move of the pawn can no longer be substituted. However, the move is not complete until
Martian chess players decide who moves first. Play turns alternate, and pass to the left after each move. The red lines in the diagrams indicate notional "canals" which divide the board into "territories", or quadrant. At any given time a player controls only those pieces that are in his or her territory. The pieces move as follows: As in chess, a square may contain no more than one piece, and a piece is captured when an enemy piece lands on the square it occupies. The capturing player removes the piece and puts it aside for later scoring. In the two-player game, a