I read a funny story involving Tal and young Kasparov. They both participated in a high-level Soviet tournament, possibly the Soviet championship. Kasparov was only 16 at the time and played some respected GM. He had an impressive game that ended in a draw, in which Kasparov could have made a speculative, high-risk sacrifice. In the post-game analysis it became clear that the sacrifice would have given Kasparov the victory. Young Kasparov said in his defense "Well, I could not calculate everything." Then Tal put his hand gently on Kasparov's shoulder and said, "Garik, you first sacrifice and then calculate!"
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