1...exf5 2.exf5 g5 3.Bg3 +/-
1...e5 2.Ne6! Nxe6 3.fxe6 Rxe6 4.Nd5 , followed by Bg4, leads to an even bigger advantage

Now Black will never be able to recover the pawn; but after 4...Nxe4 5.Nxe4 Bxe4 6.Qh6! White would have a strong attack.

White later realized his extra pawn.

Preparing ...h5-h4 to soften up the kingside.

2.cxd6 Bxd6 3.Nc5 was a better choice, when 3...Bxc5 4.Rxc5 h4! keeps the initiative – Karpov.

Softening up the f4-square for the knight.

White tries to cover both a5 and e4, but in vain.

Black has a decisive advantage.

Softening up the g6-pawn (and the black kingside as a whole) for a later attack.