[Event "Antwerp op"] [Site "Antwerp"] [Date "1995.??.??"] [Round "5"] [White "Claesen, Pieter"] [Black "Kortschnoj, Viktor"] [Result "0-1"] [WhiteElo "2390"] [BlackElo "2635"] [ECO "D31"] 1. c4 e6 2. Nc3 d5 3. cxd5 exd5 4. d4 c6 5. Nf3 Bf5 6. Bf4 Qb6 7. Na4 Qa5+ 8. Bd2 Qc7 9. b4 Nf6 10. e3 Ne4 11. b5 Ba3 12. Qb3 Qe7 13. bxc6 bxc6 14. Bd3 Nd7 15. Rb1 a5 16. Qc2 O-O 17. O-O Bg4 18. Bc1 Bd6 19. Nd2 f5 20. Qxc6 Qe6 21. Bb5 Ndf6 22. Nb6 Rab8 23. f4 Bh5 24. Nxe4 Qxe4 25. Rb3 Qe6 26. Nc4 a4 27. Rb2 a3 28. Rb3 Rxb5 29. Rxb5 dxc4 30. Re5 Qd7 31. Qxc4+ Bf7 32. Qd3 Bxe5 33. fxe5 Ne4 34. Bxa3 Rc8 0-1

[Event "EU-ch U20"] [Site "Arnhem"] [Date "1989.??.??"] [Round "?"] [White "Claesen, Pieter"] [Black "Topalov, Veselin"] [Result "1/2-1/2"] [WhiteElo "2260"] [BlackElo "2460"] [ECO "A27"] 1. c4 e5 2. Nc3 Nc6 3. Nf3 g6 4. d4 exd4 5. Nxd4 Bg7 6. Nxc6 bxc6 7. g3 Ne7 8. Bg2 O-O 9. O-O d6 10. Qd2 Be6 11. b3 Qd7 12. Bb2 f5 13. f4 Kh8 14. Rad1 Ng8 15. e4 Rad8 16. Qf2 fxe4 17. Nxe4 Bg4 18. Rde1 c5 19. h3 Bf5 20. g4 Bxe4 21. Rxe4 Rde8 22. Rfe1 Rxe4 23. Rxe4 Bf6 24. Qe2 Qg7 25. Bxf6 Qxf6 26. Bf3 c6 27. Kg2 1/2-1/2