 During her game with Kasparov in the fifth round, Kasparov gradually outplayed her and had a clear advantage after 35 moves.On his 36th move, the World Champion reportedly changed his mind about the move of a knight, and moved the piece to a different square.According to chess rules, once a player has released a piece, the move must stand, so if Kasparov did remove his hand, he should have been required to play his original move.