| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 26. M Godena vs M Olszewski |
| ½-½ | 43 |
2005 |
6th European Individual Championship | C96 Ruy Lopez, Closed |
| 27. R Goginenni vs M Olszewski |
| 1-0 | 35 |
2005 |
BELFORT YWCC Boys Under 16 | C96 Ruy Lopez, Closed |
| 28. M Olszewski vs A Aleksandrov |
| 1-0 | 59 |
2005 |
5th Amplico AIG Life | C47 Four Knights |
| 29. M Perunovic vs M Olszewski |
| 1-0 | 27 |
2005 |
6th European Individual Championship | C96 Ruy Lopez, Closed |
| 30. M Olszewski vs Pavel Rakus |
| 1-0 | 32 |
2005 |
BELFORT YWCC Boys Under 16 | B22 Sicilian, Alapin |
| 31. M Olszewski vs M Palac |
| 0-1 | 32 |
2005 |
6th European Individual Championship | B90 Sicilian, Najdorf |
| 32. R Mamedov vs M Olszewski |
| 1-0 | 46 |
2005 |
6th European Individual Championship | C55 Two Knights Defense |
| 33. M Olszewski vs Ma Flores |
| 1-0 | 34 |
2005 |
BELFORT YWCC Boys Under 16 | B22 Sicilian, Alapin |
| 34. M Olszewski vs D Reinderman |
| ½-½ | 58 |
2005 |
6th European Individual Championship | B22 Sicilian, Alapin |
| 35. P Pachta vs M Olszewski |
| 1-0 | 43 |
2005 |
BELFORT YWCC Boys Under 16 | A57 Benko Gambit |
| 36. M Olszewski vs M Neubauer |
| 1-0 | 26 |
2005 |
6th European Individual Championship | C11 French |
| 37. Ngoc Truongson Nguyen vs M Olszewski |
| 1-0 | 69 |
2005 |
BELFORT YWCC Boys Under 16 | A45 Queen's Pawn Game |
| 38. K Van der Weide vs M Olszewski |
 | 0-1 | 46 |
2005 |
6th European Individual Championship | C45 Scotch Game |
| 39. F Beck vs M Olszewski |
| ½-½ | 31 |
2005 |
BELFORT YWCC Boys Under 16 | C47 Four Knights |
| 40. M Olszewski vs M Lapcevic |
| ½-½ | 64 |
2006 |
European Youth Championship | B22 Sicilian, Alapin |
| 41. B Bogosavljevic vs M Olszewski |
| 1-0 | 47 |
2006 |
European Youth Championship | A11 English, Caro-Kann Defensive System |
| 42. M Olszewski vs S Fowler |
| 1-0 | 35 |
2006 |
European Youth Championship | C18 French, Winawer |
| 43. A Musovic vs M Olszewski |
| 0-1 | 29 |
2006 |
European Youth Championship | C55 Two Knights Defense |
| 44. M Olszewski vs T Nyback |
| 0-1 | 62 |
2008 |
Najdorf Memorial | C84 Ruy Lopez, Closed |
| 45. M Olszewski vs K Piorun |
| 1-0 | 51 |
2008 |
24th Voivoda Cup | E77 King's Indian |
| 46. M Olszewski vs Krasenkow |
| ½-½ | 38 |
2008 |
Najdorf Memorial | C67 Ruy Lopez |
| 47. M Olszewski vs A Sulypa |
| ½-½ | 11 |
2008 |
24th Voivoda Cup | C42 Petrov Defense |
| 48. Rozentalis vs M Olszewski |
| ½-½ | 62 |
2008 |
Najdorf Memorial | C68 Ruy Lopez, Exchange |
| 49. V Talla vs M Olszewski |
| 0-1 | 69 |
2008 |
24th Voivoda Cup | C95 Ruy Lopez, Closed, Breyer |
| 50. E Berg vs M Olszewski |
| 1-0 | 52 |
2008 |
Najdorf Memorial | C89 Ruy Lopez, Marshall |
