He was the "monster with 100 eyes, who sees all" whose painful defeat against IBM's Deep Blue computer heralded the end of human dominance over artificial intelligence.
Yet 20 years on Garry Kasparov is still considered the greatest chess player in history, a genius so special he became world champion at 22 and was then almost invincible for two decades.
Now, 12 years after he turned his back on the professional game, the king is back.
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