Chess players are constantly calculating variations and either accepting or dismissing them based on a comparison of how they evaluate the visualized position vs. the original position. So if you have an advantage, make an error, and then still cling to the notion that you have an advantage, then when you calculate a variation that looks equal, you will reject that line of thought because you incorrectly believe it is moving you in the wrong direction. What results is a downward spiral where the foundering player rejects variations he should accept, pushing, with hollow overconfidence, for
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