Twenty-six boards, 832 individual pieces, and 1,664 individual squares…

Twenty-six boards, 832 individual pieces, and 1,664 individual squares to keep track of all without taking notes or having any sort of memory aid and yet Alekhine never stumbled. The demonstra-tion went on for more than twelve hours, with a short break for din-ner, and when the last game was finished, shortly after two o'clock in the morning, Alekhine had won sixteen, lost five, and played to a draw in five more

— from The Instruments (Awareness/Perception/Expectations)

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