| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. J Koscielski vs M Koehler |
| 1-0 | 49 | 1999 | Sueder Sommer Open | B32 Sicilian |
| 27. S Iuldachev vs J Koscielski |
| 1-0 | 23 | 1999 | Sueder Sommer Open | B92 Sicilian, Najdorf, Opocensky Variation |
| 28. J Koscielski vs T Henrichs |
| 1-0 | 65 | 2000 | Sparkassen op-A | B80 Sicilian, Scheveningen |
| 29. Khenkin vs J Koscielski |
| 0-1 | 72 | 2000 | Bayern-chI Bank Hofmann 4th | B07 Pirc |
| 30. J Koscielski vs S Agdestein |
| 0-1 | 32 | 2000 | Bayern-chI Bank Hofmann 4th | B90 Sicilian, Najdorf |
| 31. J Koscielski vs J Reinert |
| 1-0 | 38 | 2001 | Bad Zwesten Open | C10 French |
| 32. J Hauch vs J Koscielski |
| 0-1 | 53 | 2001 | Bad Zwesten Open | E97 King's Indian |
| 33. J Koscielski vs K Kunz |
| ½-½ | 48 | 2001 | Bad Zwesten Open | B42 Sicilian, Kan |
| 34. F Schirm vs J Koscielski |
| 1-0 | 78 | 2001 | Bad Zwesten Open | A48 King's Indian |
| 35. J Koscielski vs J Dorst |
| 1-0 | 46 | 2001 | Bad Zwesten Open | B33 Sicilian |
| 36. M Emami vs J Koscielski |
| 0-1 | 38 | 2001 | Bad Zwesten Open | A04 Reti Opening |
| 37. J Koscielski vs P Kloninger |
| 1-0 | 65 | 2001 | Bad Zwesten Open | C48 Four Knights |
| 38. J Koscielski vs J Vossenkuhl |
| 1-0 | 24 | 2001 | Bad Woerishofen Open | B32 Sicilian |
| 39. D Baramidze vs J Koscielski |
| 1-0 | 39 | 2001 | Bad Woerishofen Open | B90 Sicilian, Najdorf |
| 40. J Koscielski vs G Doettling |
| 1-0 | 42 | 2001 | Dortmund Open-A | B90 Sicilian, Najdorf |
| 41. T Grotkjaer vs J Koscielski |
| 0-1 | 30 | 2001 | Dortmund Open-A | E61 King's Indian |
| 42. J Koscielski vs V Belikov |
| 0-1 | 49 | 2001 | Dortmund Open-A | B80 Sicilian, Scheveningen |
| 43. H Freiknecht vs J Koscielski |
| 0-1 | 41 | 2001 | Dortmund Open-A | B90 Sicilian, Najdorf |
| 44. J Koscielski vs K Friedrichs |
| 1-0 | 46 | 2001 | Dortmund Open-A | B01 Scandinavian |
| 45. M Saltaev vs J Koscielski |
| ½-½ | 22 | 2001 | Dortmund Open-A | B90 Sicilian, Najdorf |
| 46. J Koscielski vs A Kunte |
| ½-½ | 20 | 2001 | Dortmund Open-A | B42 Sicilian, Kan |
| 47. P Konguvel vs J Koscielski |
| 0-1 | 51 | 2001 | Dortmund Open-A | B90 Sicilian, Najdorf |
| 48. J Koscielski vs A Mikhalchishin |
| 0-1 | 39 | 2001 | Dortmund Open-A | C48 Four Knights |
| 49. J Koscielski vs R Bashilin |
| ½-½ | 52 | 2001 | Dortmund Open-A | C05 French, Tarrasch |
| 50. G Meins vs J Koscielski |
| 1-0 | 43 | 2001 | Dortmund Open-A | E73 King's Indian |
Kibitzing
