I have always said that endgame is so critical in chess and it is very painful not to be able to convert an advantage into a win.

Here is a perfect example. It is Black to move. Black is up a pawn but the Bishops are on opposite colors. If Black wins, he will tie for first in the national championship. The title was in his hand.

Can you win this position if you are Black? Can you hold this position if you are White? Play it out against a friend or against your computer. Michael Aigner is White and he held GM Fedorowicz to a draw to tie for 2nd and won the under 2400 prize.
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Chess Daily News from Susan Polgar