1...	Rg3!
2.hxg3	hxg3
3.Rfd2	Qh4
The g6 pawn wedge cramps White and his h-file comes under pressure
4.Be2	Rh7
5.Kf1	Qxf4+!
0-1
If 6.Qxf4 Rh1#
Keres-Petrosian (1959)