Upon landing on a Border square, the King has the op-tion of moving any of its ma-jor pieces (though not the Spy or itself) to either d0 or d10 and removing any piece from either camp that is already there. If the opposing King is there, the infiltrating side wins; if the opposing Spy is there, it is removed from the board. Each side can perform

infiltration once per game, no matter how many times its King lands on the Border. Left, on the black King​ reaching the Border, the player may move the rook to either d0 or d10. In the case of the former, the white rook is captured.