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...Nc6/7. Qxc6/7...Bd7/8. Qf3/8...e5/9. dxe5/9...Bb4/10. Ke2/10...Nh6

10...Nh6
This move develops and threatens Bg4. By now it is clear that Black's attack is decisive and that White won't last long.