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...Qc7/7. Qxa8/7...Bb7/8. Qxa7/8...e5

8...e5
After this, Bb4+ is threatened and the queen is trapped on a7. Nc6 and a possible Bc5 are both threatened. The only way to avoid loss of the queen is Bxc4, but after Bb4+ Bd2 Bxd2+ Kxd2 Bxc4, Black has two minor pieces for a rook and an attack, and he is close to winning. White's king will never leave the center, and it will be an inviting target for the rest of the game. Also, don't forget black's enourmous lead in development and two Bishops.