 Anand played a sharp line against the Nimzo-Indian Defence that gave him attacking chances.Instead of 20.axb4, which according to Hikaru Nakamura "was not in the spirit of the position at all", either 20.a4 or 20.f5 were suggested as more promising continuations for White.Afterwards, Carlsen defended accurately, creating counterplay on the queenside, and ultimately queening his b-pawn with check while Anand was shifting his heavy pieces over to his mating attack.