Chess Opening Theory/1. d4/1...d5/2. c4/2...c6/3. Nc3/3...dxc4/4. e3/4...b5/5. Nxb5/5...cxb5/6. Qf3/6...Nc6

6...Nc6
This move simply cuts down Black's material losses and gives black an edge straight away. After the only move, Qxc6+, Bd7! holds on. Black will have a marked queenside advantage and a 3/2 pawn majority, and white will be behind in development. If you want to keep things simple, but also limit your advantage, then this is the way to go. However, the adventurous will prefer 6...Qc7. Also, e5! will follow, ripping open central lines for Black's pieces.