How to avoid mistakes and boost your winning rate

Introduction with GM Vishnu's shocking blunder

 

 

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32.Kh1 Bxh3?? Vishnu expected White to capture back on h3. He was calculating gxh3 Rxh3+ Nh2 f3, etc., hoping to make quick work of the exposed white king; however, carried away by the superiority of his position, he had overlooked something big. A huge shock awaited him. 33.Nxf7+!-+ just wins the queen. This was a psychological mistake of sorts. Lesson: No matter how good your position is, resist complacency. The game is not over until it is over.
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WhiteEloWBlackEloBResYearECOEventRnd
Venkatesh2444Vishnu,P23401–02008IND-ch Velammal 45th3