This is a very old maxim, and these games will hopefully illustrate the pt. It's a strategic move so you have to do it at the right time.
Fischer vs Myagmarsuren, 1967 (A07) King's Indian Attack, 31 moves, 1-0
Lasker vs Alekhine, 1914 (D08) Queen's Gambit Declined, Albin Counter Gambit, 35 moves, 1-0
2 games
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