In the diagram at left, from a game between future World Champion Bobby Fischer and Jan Hein Donner, White had a probably winning advantage; Black had just moved 29..Qg5-f5 and White fell for a swindle [REF].
In this position in a rapid game in Tilburg in 1992 between former World Champion Anatoly Karpov and Alexander Chernin,[REF] White had just promoted a pawn to a queen on the e8 square.