This was a position after Topalov played Ra1 against Ponomariov

29… Rbd8? (1… f6! -+ White no longer has much of an attack. Black will slowly win this game) 30. f6 gxf6 31. Kh2 d5? (3… Rg8 {And Black would still be doing fine} 4. Qxf7 Rg7 -+) 32. Nxf6! Bxf6 33. d4! Qxa2 34. Rxa2 and Black’s position is hopeless. Black resigned on move 65.

The sacrifice by Topalov was basically unsound. But for some inexplicable reasons, Ponomariov made a series of bad moves which resulted in a horrible loss.
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Chess Daily News from Susan Polgar