Advance flank pawns when center is closed/fixed

Advance flank pawns when center is closed/fixed
Compiled by notyetagm

23 - g7-g5, 26 - h7-h5 leads to powerful attack, center blocked
Speelman vs S Agdestein, 1992
(E41) Nimzo-Indian, 38 moves, 0-1
Mamedyarov vs Carlsen, 2008
(E12) Queen's Indian, 44 moves, 0-1

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