Kasparov makes illegal move to mate???

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Empathy1

When Kasparov mates his opponent, the chess world thinks this was an illegal move.  My question is how can a move be considered illegal if he won the game?   Can someone please explain. Thanks

https://www.youtube.com/watch?feature=player_embedded&v=YgeYScYe8wI

mrhjornevik

now I get why new players struggle, but to me it looked fair :P

Empathy1

I thought is was a fair move as well :)