6 ... d5xc4 makes Black d8-queen loose; she promptly vanishes J Henningsen vs R Borik, 1979  (A00) Uncommon Opening, 7 moves, 1-0 12 Nf4xd5! loose d5-pawn becomes loose d5-bishop, remove guard Nakamura vs M Vachier-Lagrave, 2008  (A57) Benko Gambit, 41 moves, 1-0