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You wrote <<MadBishop> You give 9.Bxf6!?, though I'm not sure why-this has been oft-played at grandmaster level>
Interestingly, <Mad Bishop's> annotation of this move has an historical back story- it was a prepared innovation by Korchnoi, who was the first to play it at master level: http://www.chessgames.com/perl/ches....
Position after 9.Bh4xf6
click for larger view
"I prepared an interesting innovation in a well-known variation of the Queen's Gambit, which was quite often adopted by Geller... In the fifth game... Geller played not the King's Indian, but the Queen's Gambit, hoping for a draw as quickly as possible. I played my prepared innovation. I personally consider it to be quite an important one, but for some reason it did not even appear in the list of thirty innovations mentioned in the appropriate issue of'Informator.'"
-<Victor Korchnoi, "Chess is My Life" (Edition Olms 2004), pp.75-76>
Here's what Keres had to say about the move:
"9.BxN! (an interestng idea. Usually White exchanges on KB3 immediately on the 7th move, if he decides to do so at all. The text has the idea of forcing the Bishop to QN2 first, where it does not stand very well)"
<Paul Keres, "Korchnoi 5½ Geller 2½" "Chess Life and Review" (August 1971), p.426>