Correct was 1...Bxg4 2.Qxg4 g6 avoiding any problem with 3.Nf5 , which can now be met by Qe6.

White wins.

Securing the exchange of at least one of the attackers on e5 and g5.

2.Bh4? Nxe5 3.dxe5 Nxc3 Black achieves favourable exchanges.

Black has no problems.

Swapping the powerful bishop, which is vital for White's attack.

White does not have sufficient compensation for the pawn.

Anatoly Karpov turns 73 today. Karpov was World Champion from 1975 to 1985, and FIDE World Champion from 1993 to 1999. Throughout his chess career, Karpov has been known for his strategic prowess and his tournament successes, which include over 160 first-place finishes.

Swapping the active enemy bishop in order to seize the long diagonal with the queen.