The Hungarian has regained his pawn and now his bishops are dominant. 20.Qb3 - White has no need to hurry. First of all he improves the position of his queen and bishop. Now after Black recaptures White can just increase the pressure with Rf3, Raf1 etc. Fedorov has control of the only open file on the board but White is edging forwards with his pawns on the kingside.
Chances seem balanced.
White wants to drive the black rook from f8 with 18 Ba3 in order to get control of the f file. Leko has good compensation for his pawn in the shape of the light squared bishop which completely dominates the knight on a3. Anand will need to use all his fantastic defensive skill to keep the balance. 17 Rxf3 gives White a strong attack. After long thought Kasparov sounds the charge.