Bakh in the USSR
Here is a cool game that I stumbled across recently. It is yet another example of how powerful connected passed pawns can be, and how large amounts of material can be sacrificed just to promote on of them. In the game, Averbakh takes advantage of the position of Geller's pawns to win one of them in the middlegame. He then is able to start a pawn-storm on the queenside, and soon enough, they are so powerful that he is able to sacrifice both of his rooks, one after the other. Geller has no defense and is forced to capitulate.