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Confidence is very important - even pretending to be confident. If you make a mistake but do not let your opponent see what you are thinking then he may overlook the mistake.

"Vishy Anand: 'Chess is like acting'". SPIEGEL Interview with Ansbert Kneip,Maik Großekathöfer, en.chessbase.com. October 1, 2008.
Confidence is very important - even pretending to be confident. If you make a mistake but do not let your opponent see what you are thinking then he may overlook the mistake.