One of Mikhail Tal's most anthologized games is one he played against Alexander Tolush in the 23rd Soviet Championship, in which Tolush essayed the Sicilian Poisoned Pawn variation years before Bobby Fischer tried it, and was blown off the board by one of Tal's patented sacrifical attacks. A great game, often reprinted.

But what they usually don't tell you is that Tolush managed to improve on his play later on. Playing the same variation in the 25th Championship, against Korchnoi, Tolush came up with a seemingly innocuous improvement on the 12th move, which allowed him to sacrifice Queen for Rook and two Minor Pieces, and make it to a winning endgame.