[drdeca]

This may be true, but as true is it also that when one has checkmated the opponent's king, one is no longer winning at chess. Instead, one has won at chess. And if play continues, the game is no longer chess. This would not mean though that one has not won at chess.

[dylanjermiah]

I would say it's more like physically hitting the opponents king off the board and claiming you've won at chess.