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There are two different logically coherent ways of resolving this. I remember a quote from <i>Bobby Fischer Teaches Chess</i>: 'The object of the gamee is to capture the enemy King. The capture is never actually carried out.' This is what checkmate is about. So we have: 1. If checkmate and and occupying both goal sqaures are equal priority win conditions, then you can occupy the second goal square and win even in a checkmated position because the win occurs before the King capture would have, were it carried out. (So under this interpretation, there is no checkmate in this position.) 2. If Checkmate is the primary win condition and occupying the goal squares is a secondary win conditon, then it is illegal to occupy the second goal square when checkmated--the game is over and you have lost. It is also illegal to occupy the second goal square when in check (unless the move coincidentally removes the attack on the King). Personally I prefer #1, but #2 is easier to program in Zillions.