This is the critical position of the game white has allowed black to capture a central pawn in exchange for attacking chances. The Berlin Defense has been out of favor for twenty years as more and more grandmasters turn to computers for analysis. Gary Kasparov armed with an array of computers and a crack team of grandmaster assistants was totally unprepared. Vladimir Kramnik knew he had little chance for the win but he most certainly could draw.

Now is the time to write down your  moves for white.
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Kotkov
Nezhmetdinov