In perhaps the greatest piece of calculation in Kasparov's storied career, IM Kiewra shows the masterpiece at Wijk aan Zee in 1999. If we could have peered into the world champion's thinking process, it would have gone like this: "Hey, I can sac both rooks, lure Black's king toward me, almost get mated myself, threaten mate with just my pawns, and win by retreating my bishop back to its home square." Yeah, this is a classic.