Withdrawing the queen from the exposed d4-square before taking actions on the kingside.
Exploiting the fact that after 1...Qxc5 2.Rc1 followed by Nc7, White creates a protected square on d6.
4...e4 was preferable, securing this pawn, when 5.Rad1 followed by f2-f3 keeps pressure.
With the strong plan of Bxc6 and Nc4, conquering the e5-pawn. The game continued: