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.

By attacking the e2-pawn Black provokes a concession from White.

After 2.f3?! Be6 a weak square appears on e3, and the fianchettoed bishop becomes severely restricted.

The exchange on d4 has yielded Black a semi-open file and reduced White's dynamic potential.