Smyslov vs. Botvinnik, Moscow, 9th game of the 1954 World Championship Match.
Black has just given a check with Re4. Smyslov’s reply is brilliant: 19. Qxe4! A queen sacrifice! 19… dxe4 20. Rb8+ Bc8 21. Bb5+ Qxb5 22. Rxb5, and White has a winning material advantage. Botvinnik resigned a few moves later.