| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. R Goginenni vs M Olszewski |
| 1-0 | 35 |
2005 |
BELFORT YWCC Boys Under 16 | C96 Ruy Lopez, Closed |
| 2. M Kopczynski vs M Olszewski |
| 0-1 | 28 |
2005 |
6th European Individual Championship | C84 Ruy Lopez, Closed |
| 3. M Perunovic vs M Olszewski |
| 1-0 | 27 |
2005 |
6th European Individual Championship | C96 Ruy Lopez, Closed |
| 4. Bologan vs M Olszewski |
| 1-0 | 42 |
2005 |
5th Amplico AIG Life | C96 Ruy Lopez, Closed |
| 5. M Godena vs M Olszewski |
| ½-½ | 43 |
2005 |
6th European Individual Championship | C96 Ruy Lopez, Closed |
| 6. J Gdanski vs M Olszewski |
| 1-0 | 53 |
2005 |
5th Amplico AIG Life | C96 Ruy Lopez, Closed |
| 7. E Berg vs M Olszewski |
 | 1-0 | 52 |
2008 |
Najdorf Memorial | C89 Ruy Lopez, Marshall |
| 8. B Socko vs M Olszewski |
| 1-0 | 29 |
2008 |
Najdorf Memorial | C69 Ruy Lopez, Exchange, Gligoric Variation, 6.d4 |
| 9. Rozentalis vs M Olszewski |
| ½-½ | 62 |
2008 |
Najdorf Memorial | C68 Ruy Lopez, Exchange |
| 10. V Talla vs M Olszewski |
| 0-1 | 69 |
2008 |
24th Voivoda Cup | C95 Ruy Lopez, Closed, Breyer |
| 11. C Balogh vs M Olszewski |
| ½-½ | 39 |
2008 |
Najdorf Memorial | C69 Ruy Lopez, Exchange, Gligoric Variation, 6.d4 |
| 12. V Talla vs M Olszewski |
| 0-1 | 69 |
2009 |
24th Voivoda Cup | C95 Ruy Lopez, Closed, Breyer |
