4...h3 5.Qf2 , followed by Rh4, and the h3-pawn is doomed.

Preparing h2-h4 with a decisive advantage.

Preparing Bg3 with an attack on the weak d6-pawn.

Parrying the threat of 3 c5, but now White finds a new angle for the attack on d6.

3...Ra8 4.Bxd6 Bxc4 5.Bxc4 Bxd6 6.Qb3 and White wins – Illescas.

With a sound extra pawn and the black king stranded in the centre, the rest is easy.

Preparing ...Nb6 with an attack on the weak c4-pawn.

Preparing ...b7-b5.

5.c5 Bb3 6.Nb6 Nxb6 7.axb6 a5 White ends up with a bad pawn structure.