Best response to the Queen's Gambit Accepted: Showalter Variation (D24)

1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. Nc3 · Black to move

What is the best response to the Queen's Gambit Accepted: Showalter Variation (1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. Nc3)? Black to move. See the top replies ranked by opening theory and real-game results, starting with Nc6.

The main theoretical reply is Nc6, reaching the Queen's Gambit Declined: Chigorin Defense, Modern Gambit.