| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 276. M Olszewski vs J Leveikina |
| 1-0 | 29 | 2017 | European Rapid Championship | B12 Caro-Kann Defense |
| 277. K Kratochvil vs M Olszewski |
| 0-1 | 61 | 2017 | European Rapid Championship | E32 Nimzo-Indian, Classical |
| 278. M Olszewski vs V Gazik |
| 0-1 | 32 | 2017 | European Rapid Championship | B76 Sicilian, Dragon, Yugoslav Attack |
| 279. Emery Peterson vs M Olszewski |
| 0-1 | 53 | 2017 | European Rapid Championship | D00 Queen's Pawn Game |
| 280. M Olszewski vs I Janik |
| 0-1 | 62 | 2017 | European Rapid Championship | A23 English, Bremen System, Keres Variation |
| 281. Vachier-Lagrave vs M Olszewski |
| 1-0 | 39 | 2018 | Bundesliga 2017/18 | C92 Ruy Lopez, Closed |
| 282. M Olszewski vs M Oleksienko |
| ½-½ | 30 | 2018 | Bundesliga 2017/18 | A15 English |
| 283. M Olszewski vs A Volokitin |
| ½-½ | 24 | 2018 | Bundesliga 2017/18 | E10 Queen's Pawn Game |
| 284. Ponomariov vs M Olszewski |
| 1-0 | 40 | 2018 | Bundesliga 2017/18 | C78 Ruy Lopez |
| 285. V Dragnev vs M Olszewski |
 | 1-0 | 41 | 2018 | Bundesliga 2017/18 | E15 Queen's Indian |
| 286. N Grandelius vs M Olszewski |
| 1-0 | 34 | 2018 | Bundesliga 2017/18 | B94 Sicilian, Najdorf |
| 287. M Olszewski vs L Mons |
| ½-½ | 48 | 2018 | Bundesliga 2017/18 | C84 Ruy Lopez, Closed |
| 288. M Olszewski vs T Markowski |
| 1-0 | 32 | 2019 | TCh-POL Ekstraliga | C18 French, Winawer |
| 289. I Janik vs M Olszewski |
| 0-1 | 73 | 2019 | TCh-POL Ekstraliga | E60 King's Indian Defense |
| 290. M Olszewski vs T Markowski |
| ½-½ | 41 | 2020 | TCh-POL Ekstraliga | B41 Sicilian, Kan |
| 291. M Olszewski vs K Piorun |
| 0-1 | 41 | 2020 | TCh-POL Ekstraliga | E47 Nimzo-Indian, 4.e3 O-O 5.Bd3 |
| 292. T Warakomski vs M Olszewski |
| ½-½ | 9 | 2020 | TCh-POL Ekstraliga | C55 Two Knights Defense |
Kibitzing
