1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. Ne5 e6 7. f3 Bb4 8. e4 Bxe4 9. fxe4 Nxe4 10. Qf3 10. Bd2 Qxd4 11. Nxe4 Qxe4+ 12. Qe2 Bxd2+ 13. Kxd2 Qd4+ is the critical continuation. 10... Qxd4 11. Qxf7+ Kd8 12. Qxg7?? An amazing blunder. A well-known draw arises from 12. Bg5+ Nxg5 13. Qxg7 Bxc3+ 14. bxc3 Qxc3+ 15. Ke2 Qc2+ 16. Ke1 Qc3+ 17. Ke2 12... Bxc3+ 13. bxc3 Qf2+ and mate on c3 next move. 0-1