Preparing ...Ng6-f4 with an even game.

Prophylaxis against the plan of 1...Ne7, heading for g6.

Now that his plan no longer works, Black is limited to defensive actions. It also becomes evident that the ...g6-g5 advance has just produced weaknesses.

1...Ne7 can be met by 2.Qb6! , forcing a queen exchange and winning one of the pawns at b7 and d6.

In view of the threat 5 Ne4, the rook has to retreat.

Preparing Ng3-f5. White is clearly better.

1...h6 has the simple idea of 2.f4?? g6 , trapping the queen. White is left without a natural plan.

Destroying the enemy queenside.

With the double idea of 6...Rxc5 and 6...d3 followed by ...Qd4. Black went on to win.