4...Re8 5.f5 g5 6.Bf3! , intending 7 Bh5 – Geller.

The knight retreats so that the bishop on b2 enhances a future e4-e5 or f4-f5 advance.

Fighting for the d6-square.

White is winning.

A pawn sacrifice to create some activity before White consolidates.

4.cxd4 Ba6 5.Qc5 Qb7! with compensation – Tunik.

Black finally accepts the queen exchange, aware that he will soon be able to create new threats.

with equality.

A strong blow that prepares Rac1 with new threats and destroys Black's kingside before he castles into safety.