5.axb5? f3 Black obtains a strong attack.

Black isn't interested in a draw by repetition and directs his last piece at the enemy kingside.

With a strong initiative.

Preparing b5-b6 with decisive damage to Black's pawn chain.

Or 2...dxc5 3.Qxe5 with a crushing advantage.

3...cxb6 4.cxd6 Qf8 5.Qxb6 is equally hopeless.

Black resigned.

Undermining the white pawn chain and enhancing a future queenside attack.

Black moves his focus from the d4-pawn to the one on c3. Due to his crippled pawn structure White is unable to launch a similar attack on the kingside.