|Ezzy: Karpov v Korchnoi
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Karpov played 41 Re1 - "Karpov shows lack of simple court craft. It would have been more practical to seal this move as black's reply is forced, and white could have found the win in home analysis. Also black would have to analyse the consequences of 41 a5.
The position at the adjournment. Karpov thought for 30 minutes and then sealed an astonishingly weak move 42 Qd6?? - The simple 42 Qxb6 wins easily.
Korchnoi had considered the sealed move overnight, and already thought it would lead to a draw. After the game he said, "When I saw the sealed move, I was so overjoyed I became careless and made some weak moves, almost losing the game.
<Notes taken from my 'chess' magazine October 1978>