[Event "Zuerich op-B 14th"]
[Site "Zuerich"]
[Date "1990.??.??"]
[Round "?"]
[White "Koechlin, S."]
[Black "Pietruszak, Thomas"]
[Result "1-0"]
[ECO "B19"]
[PlyCount "115"]
[EventDate "1990.12.26"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "SUI"]
[SourceTitle "EXT 1997"]
[Source "ChessBase"]
[SourceDate "1996.11.15"]
[SourceVersion "1"]
[SourceVersionDate "1996.11.15"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. Nf3 Nd7 7. h4 h6 8. Bd3 Bxd3 9. Qxd3 Qc7 10. Bd2 e6 11. c4 Ngf6 12. 0-0-0 0-0-0 13. Kb1 Kb8 14. Qc2 Bd6 15. Ne2 c5 16. Nc3 a6 17. Na4 cxd4 18. Nxd4 Rc8 19. Rc1 Nc5 20. f3 Nfd7 21. Nxc5 Qxc5 22. Nb3 Qc7 23. Be3 Nc5 24. Nd4 Bf4 25. Qd2 Bxe3 26. Qxe3 Rhd8 27. Rhd1 Rd6 28. b4 Rcd8 29. bxc5 Qxc5 30. Nc2 Rb6+ 31. Ka1 Rxd1 32. Rxd1 Qc7 33. Qd4 Rc6 34. Qd8+ Qxd8 35. Rxd8+ Kc7 36. Rd4 e5 37. Rg4 g6 38. Re4 Kd6 39. f4 exf4 40. Rxf4 f5 41. Ne3 Ke5 42. g3 Rd6 43. Nd5 b5 44. Nb4 g5 45. hxg5 hxg5 46. Rf1 bxc4 47. Re1+ Kf6 48. Kb2 a5 49. Nc2 Rd3 50. Re3 f4 51. gxf4 gxf4 52. Rxd3 cxd3 53. Nd4 Ke5 54. Kc3 Ke4 55. Nb3 Ke3 56. Nxa5 f3 57. Nc4+ Ke2 58. a4 1-0

[Event "Zuerich op-B 14th"]
[Site "Zuerich"]
[Date "1990.??.??"]
[Round "?"]
[White "Mella, Leonardo"]
[Black "Koechlin, S."]
[Result "1-0"]
[ECO "B25"]
[PlyCount "68"]
[EventDate "1990.12.26"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "SUI"]
[SourceTitle "EXT 1997"]
[Source "ChessBase"]
[SourceDate "1996.11.15"]
[SourceVersion "1"]
[SourceVersionDate "1996.11.15"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 d6 3. g3 Nc6 4. Bg2 g6 5. d3 Bg7 6. Bg5 Nf6 7. h3 h6 8. Be3 0-0 9. Qd2 Kh7 10. f4 Qa5 11. Nf3 Nd7 12. 0-0 Rb8 13. Nh2 Nd4 14. Qf2 b5 15. a3 Bb7 16. Rac1 b4 17. axb4 Qxb4 18. Nd1 Qb5 19. b3 a5 20. g4 a4 21. Nc3 Qb4 22. Nxa4 Bc6 23. Bd2 Qb7 24. Nc3 Nxc2 25. Rxc2 Qxb3 26. Rfc1 Nb6 27. Nf3 Na4 28. Kh2 Nb2 29. Ne1 Bb7 30. Be3 Ba6 31. Qd2 c4 32. d4 Nd3 33. Rb1 Qxb1 34. Nxb1 Rxb1 1-0

