Calculating lines

And now, classic chess. In this video, Kasparov is explaining all his threads of thinking during one of his matches against Karpov. He won sacrificing his Queen, somtehing that is very unusual among Grandmasters. There are two things that impress me the most:

1.- How Kasparov can remember all the positions of the pieces each time he starts to explain one line and how he handles the pieces (mine were propably be all over the ground at his speed).

2.- How Karpov was as amazing as Kasparov. He checks all the possibilities after the last Kasparov’s move in just seconds and correctly decides to resign.

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