Question about what Kasparov and Karpov are writing in this video?

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Nick3312

I really like this video that highlights the rivalry between Kasparov and Karpov over the years. My question is, you see them writing stuff down through out the whole game, what are they writing down? Sometimes it only looks like they crossed something out.

 http://www.youtube.com/watch?v=XvcxzGnVQWI

I know they are probably writing down the moves. COuld they be writing the possible variations? I know someone said "to help with the openings" but haven't these two men already mastered the openings to an extent?

ClavierCavalier

Just the moves.