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Preventing an enemy attack with ...b5-b4 and ...a5-a4.
1...Rae8 2.h3 Kh8 3.g4!?
The most consistent choice.
3...Qh4
By attacking f2 Black interferes with the plan of Rdg1 and g4-g5.
4.Rdf1 e5
A less active defence permits 5 f3 with central activity.
5.dxe5 Bxe5 6.f4! Bb8 7.Qb2
Preparing Bc3 with a promising attack.
Kasparov - Gligoric
Lucerne Olympiad 1982
White to move
An excellent measure of restriction, which takes the e4-square away from several black pieces, and soon d5 as well.
1...Qc7
1...Nf5 2.Qc3 Bb7 3.e4 , keeping the advantage.
2.e4 Ba8 3.b5!
Fixing a target on a7. We can also notice that the bishop on a8 has turned into a very passive piece.
3...Nfe8 4.Qa4 f5
This leads to new weaknesses, but Black was short of constructive ideas.
5.Qb3! Qc8 6.exf5 Qc5+?!
Now White manages to swap the enemy's active queen. Preferable was 6...Nxf5 7.Qc3 with a clear, though not decisive advantage – Kasparov.