The plan of f4 vs f5 facing f-pawn is an important defensive idea. Petrosian played 11.f4 to prevent the ...f4 idea and restrain Bc8, when black would have typical counterplay. The unique part of Petrosian's idea was to prepare and support f4 with Nh3.
11.f4
Here is the feature game.
English Reversed Sicilian[A25]
EU-chT (Men) Oberhausen (8.3), 29.06.1961
Position 1
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