Provoking f2-f3 in order to soften up the dark squares around the white king.

Clearing the g1-a7 diagonal for the bishop.

Now the knight on g3 becomes exposed;

4.Be3 d2! 5.Qcd2 Ne5 -+

White resigned.

By hitting the a7-pawn and hampering ...g7-g6, White provokes the undesirable ...c6-c5.

1...a5 2.0-0-0 leaves Black without reasonable moves.

Now a weak square has appeared on d5.

With a sound extra pawn, White soon won.