TheAlchemist: This was a clincher for Polugaevsky to beat Geller in their match.
11...Qb6 was a dubious novelty, Geller and his second Gufeld found a brilliant refutation the same night, but Polugaevsky's instincts were very alert and he didn't use this variation anymore.
Seven years later, Gufeld was Maia Chiburdanidze's second. They were preparing for this variation, but Gufeld didn't want to reveal the "secret" to Maia and thus betray his friend Geller. He just said to Maia, that white can win tactically on his 12th move and everything else was done by her. Thus she unearthed the brilliant refutation Geller and Gufeld had in store for 7 long years.
Meanwhile Polugaevsky had found it too and didn't employ this line anymore, it was, it seems, a bluff that worked out great for him.
Chiburdanidze vs Dvoirys, 1980
The game above was properly dubbed "The Tallinn Pearl".