| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. P Weichhold vs J Szostko |
| ½-½ | 82 | 2015 | Teplice Open | A00 Uncommon Opening |
| 27. J Szostko vs A Hnydiuk |
| 1-0 | 44 | 2015 | Teplice Open | C67 Ruy Lopez |
| 28. J Szostko vs V Plat |
| ½-½ | 60 | 2015 | Teplice Open | C41 Philidor Defense |
| 29. A Bykhovsky vs J Szostko |
| 1-0 | 56 | 2015 | Teplice Open | E81 King's Indian, Samisch |
| 30. D Sadzikowski vs J Szostko |
| ½-½ | 41 | 2015 | Teplice Open | D36 Queen's Gambit Declined, Exchange, Positional line, 6.Qc2 |
| 31. J Szostko vs P Kucera |
| 0-1 | 32 | 2015 | Teplice Open | B32 Sicilian |
| 32. J Szostko vs J Chmelik |
| 1-0 | 25 | 2015 | Teplice Open | B83 Sicilian |
| 33. G Nagy vs J Szostko |
| 0-1 | 45 | 2015 | Teplice Open | B10 Caro-Kann |
| 34. J Szostko vs M A Tabatabaei |
| 0-1 | 40 | 2016 | Najdorf Mem Open A | C69 Ruy Lopez, Exchange, Gligoric Variation |
| 35. A Kveinys vs J Szostko |
| 1-0 | 57 | 2016 | XXXV Zamenhofa Mem | E63 King's Indian, Fianchetto, Panno Variation |
| 36. J Szostko vs M Kanarek |
| ½-½ | 53 | 2016 | XXXV Zamenhofa Mem | B32 Sicilian |
| 37. S Gumularz vs J Szostko |
| ½-½ | 43 | 2017 | MetLife Warsaw Najdorf Chess Festival | E63 King's Indian, Fianchetto, Panno Variation |
| 38. J Szostko vs M Percivaldi |
| 0-1 | 74 | 2017 | MetLife Warsaw Najdorf Chess Festival | C11 French |
| 39. J Heinemann vs J Szostko |
| 0-1 | 32 | 2017 | MetLife Warsaw Najdorf Chess Festival | B96 Sicilian, Najdorf |
| 40. J Szostko vs A Skawinski |
| ½-½ | 37 | 2017 | MetLife Warsaw Najdorf Chess Festival | C78 Ruy Lopez |
| 41. R Przedmojski vs J Szostko |
| ½-½ | 34 | 2017 | MetLife Warsaw Najdorf Chess Festival | E81 King's Indian, Samisch |
| 42. J Szostko vs S Zylka |
| ½-½ | 24 | 2017 | MetLife Warsaw Najdorf Chess Festival | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 43. M Bartel vs J Szostko |
| ½-½ | 31 | 2017 | MetLife Warsaw Najdorf Chess Festival | B50 Sicilian |
| 44. J Szostko vs H Moehn |
| ½-½ | 88 | 2017 | MetLife Warsaw Najdorf Chess Festival | B28 Sicilian, O'Kelly Variation |
| 45. O Zujev vs J Szostko |
| 1-0 | 63 | 2017 | MetLife Warsaw Najdorf Chess Festival | E81 King's Indian, Samisch |
| 46. J Szostko vs P Bobras |
| 1-0 | 34 | 2017 | Zamenhof Memorial | B33 Sicilian |
| 47. J Szostko vs M Kanarek |
| 0-1 | 79 | 2017 | Zamenhof Memorial | C60 Ruy Lopez |
| 48. M Krzyzanowski vs J Szostko |
| ½-½ | 47 | 2017 | Zamenhof Memorial | A45 Queen's Pawn Game |
| 49. M Sieciechowicz vs J Szostko |
| ½-½ | 63 | 2017 | Zamenhof Memorial | E92 King's Indian |
| 50. J Kosakowski vs J Szostko |
| ½-½ | 36 | 2017 | Zamenhof Memorial | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
Kibitzing
