2...dxc4 (Queen's Gambit Accepted) (QGA) 2...Nc6 (Chigorin Defense) 2...c5 (Symmetrical Defense) 2...c6 (Slav Defense) 2...e5 (Albin Countergambit) 2...e6 (Queen's Gambit Declined) (QGD) 2...Bf5!? (Baltic Defense) 2...Nf6?! (Marshall Defense) 2...g6 (Alekhine's Variation)