<human>:  Why did Kasparov lose the chess game between Kasparov and Anand?
<bot>: Kasparov lost because he made a mistake. He played a pawn to the wrong square. The pawn should have been moved to the fourth rank, but instead it was moved to the third rank. This is called a 'pawn fork.' This is a common mistake for beginners, but it is a bad idea for experienced players.