The Pearl of Wijk aan Zee

I belong to a private chess.com group where a member posts a complex position every week or so and the other members perform a stoyko exercise, writing out all the their analysis of the position and then deciding on their choice for the best line. It has been trememdously helpful for my calculation.

It was my turn this past week and, since I'm currently finishing up Winning Chess Combinations by Seirawan, I chose the following position to post to the group. This position is from a Kasparov-Topalov game that has been called "The Pearl of Wijk aan Zee" and considered by some to be Kasparov's finest game.

Take 30 minutes or so and write down all the lines that you can visualize in this position and then decide which is best for white.