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Wow thread necromancy. It has been a long four years. The problem with not meeting Bb7 with d5 is that the position after the double exchange of pawns 13. Nbd2 exd4 14. Nxd4 scores well for black and is at least equal. See also 11...Bb7 12. Nbd2 cxd4 13. cxd4 exd4 14. Nxd4.