1. e4 e5 2. Nf3 Nf6 3. d4 Nxe4 4. dxe5 Bc5!? The main line goes 4...d5. The text move is know to lead to enormous complications that tend to favour White. Apparently Ivanchuk had his own ideas. While preparing for this idea, Ivanchuk must have seen the following game as well. The idea was used already 154 years ago to beat the then strongest player in the world, Adolf Anderssen. Black subtly "improved" on Ivanchuk's game by first forcing a pawn to c3! 4... Bb4+ 5. c3 Bc5 6. Qd5 Bxf2+ 7. Ke2 f5 8. exf6? This, without Bb4 and c3, is known to be bad for White. 8... Nxf6 9. Qe5+ Kf8 10. Bg5 Bb6 11. Kd1 d6 12. Qf4 Be6 13. Bd3 Nc6 14. Nbd2 Ne5 15. Be4 Ng6 16. Bxg6 hxg6 17. Nh4 Bf7 18. Ne4 Qd7 19. Nxf6 gxf6 20. Bxf6 Rh7 21. Rf1 Kg8 22. Qg3 Qb5 23. Rf5 Qxb2 24. Nxg6 Qxa1+ 25. Kd2 Qxa2+ 26. Kd3 Bc4+ 27. Ke4 Qe2+ 28. Kf4 Qf2+ 0-1, Anderssen-Eichborn, Breslau 1853 5. Qd5 Bxf2+ 6. Kd1!? f5 7. Bc4 Qe7 8. Nc3 c6 9. Qd3 b5 10. Bb3 a5 11. a4 b4 12. Nxe4 fxe4 13. Qe2 White did not like 13. Qxe4 d5 13... d5 14. exd6? White should have played 14. Qxf2 exf3 15. Qxf3 14... Qxd6+ 15. Bd2 e3 16. Rf1 Ba6 17. Bc4 Bxc4 18. Qxc4

18... Ra7! A great move. 19. Ke2 Re7 20. Be1 Qg6 21. g3 Re4 22. Qd3 Nd7 23. Rd1?

Losing on the spot. Tougher was 23. Bxf2 Nc5 24. Qd1 exf2+ 25. Kxf2 O-O 26. Kg1 23... O-O! 24. Qxd7 Qh5 25. g4 Qh3 26. Ng5 Qg2 27. Bxf2 Rxf2+ 28. Rxf2 exf2+ 0-1