| Game | Result | Opening | Date |
|---|---|---|---|
| Katajainen, Sebastian – Lampart, Alfons (2014) | 0-1 | Sicilian Defense: Scheveningen Variation, Classical Variation | 2026-07-24 |
| Lampart, Alfons (2014) – Katajainen, Sebastian | 1/2-1/2 | Queen's Gambit Declined: Modern Variation | 2026-07-24 |
| Jaillet, Léon – Katajainen, Sebastian | 1-0 | Italian Game: Two Knights Defense, Ponziani-Steinitz Gambit | 2026-07-23 |
| Katajainen, Sebastian – Jaillet, Léon | 0-1 | French Defense: Advance Variation, Paulsen Attack | 2026-07-23 |
| Hochstrasser, Sylvain (1554) – Katajainen, Sebastian | 1/2-1/2 | Queen's Pawn Game: London System, with e6 | 2026-07-22 |
| Katajainen, Sebastian – Hochstrasser, Sylvain (1554) | 1-0 | Vienna Game: Stanley Variation, Meitner-Mieses Gambit | 2026-07-22 |
| Katajainen, Sebastian – Theubet, Capucine | 1-0 | Vienna Game: Vienna Gambit | 2026-07-21 |
| Theubet, Capucine – Katajainen, Sebastian | 0-1 | King's Pawn Game: King's Head Opening | 2026-07-21 |
| Neboisa, Illijin (2123) – Katajainen, Sebastian | 1-0 | Tarrasch Defense: Symmetrical Variation | 2026-07-20 |
| Katajainen, Sebastian – Neboisa, Illijin (2076) | 0-1 | Sicilian Defense: French Variation, Normal | 2026-07-20 |
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