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3. cxd5 definitely doesn't deserve any ?! marks. While you are giving up all your good pieces, white can ignore the a2 pawn and get 3 or 4 pieces developed before anything but the black queen is out. Even better than the real Queens Gambit.
5. e3 Qxa2 6. Bd2 followed by Rc1 is great. Even if black doesn't chase after the pawns, white gets a good position and the two bishops. Something like 5. e3 e6 6. Bd2 Nf6 7. Rc1 Bd6 8. Nf3 O-O 9. Bc4
5...e5 6. Ne2 seems to work out well for White but it looks like Black's best option to me.
(hide) If you don't want other users to know what you are doing you can change into cloak mode in Settings (paying members only). (pauloaguia) (show all tips)