How did Kasparov advance theory before strong computers?
I have been going over Kasparov's games and jesus christ how did this man find this stuff before engines existed?! Between his d5 pawn sac in his octopus knight game, his Bc2 novelty against Anand in 95 and many others I am just amazed at how he found all these vicious correct continuations. The better I have gotten at this game the better I think he is. His chess is beautiful!