| Jun 17, 2026 | Koskinen | 0–1 | Dorrance | 38th International Chess Tournament Open Pula 2026 | Catalan Opening: Closed | |
| May 3, 2026 | Gharibyan | 1–0 | Koskinen | Round 1: Gharibyan, Mamikon - Koskinen, Henri | Queen's Pawn Game: London System | |
| Jun 14, 2025 | Ortobelli Lozza | ½–½ | Koskinen | Round 9: Ortobelli Lozza, Marco - Koskinen, Henri | Rapport-Jobava System | |
| Jun 13, 2025 | Koskinen | 0–1 | Gusain | Round 8: Koskinen, Henri - Gusain, Himal | Queen's Gambit Declined | |
| Jun 12, 2025 | Vidal | 0–1 | Koskinen | Round 7: Vidal, Llewellyn - Koskinen, Henri | Ruy Lopez: Morphy Defense, Anderssen Variation | |
| Jun 11, 2025 | Koskinen | ½–½ | Tellarini | Round 6: Koskinen, Henri - Tellarini, Lorenzo | Queen's Indian Defense: Kasparov-Petrosian Variation, Classical Variation | |
| Jun 10, 2025 | Pirvulescu | 0–1 | Koskinen | Round 5: Pirvulescu, Adrian - Koskinen, Henri | Ruy Lopez: Classical Defense, Benelux Variation | |
| Jun 9, 2025 | Koskinen | 1–0 | Simoni | Round 4: Koskinen, Henri - Simoni, Matteo | Zukertort Opening: Reversed Grünfeld | |
| Jun 9, 2025 | Bordignon | 1–0 | Koskinen | Round 3: Bordignon, Angelo - Koskinen, Henri | Ruy Lopez: Morphy Defense, Modern Steinitz Defense | |
| Jun 8, 2025 | Koskinen | ½–½ | Budai | Round 2: Koskinen, Henri - Budai, Leonardo | Old Indian Defense: Two Knights Variation | |
| Jun 7, 2025 | Comisso | ½–½ | Koskinen | Round 1: Comisso, Daniele - Koskinen, Henri | Pirc Defense | |
| Dec 20, 2024 | Koskinen | 0–1 | Domingo Nunez | XI Sunway Sitges International Chess Festival 2024 - Group A | English Opening: Great Snake Variation | |
| Dec 19, 2024 | Isanzhulov | 1–0 | Koskinen | XI Sunway Sitges International Chess Festival 2024 - Group A | Ruy Lopez: Morphy Defense, Modern Steinitz Defense | |
| Dec 18, 2024 | Leisch | 0–1 | Koskinen | XI Sunway Sitges International Chess Festival 2024 - Group A | ? | |
| Dec 16, 2024 | Koskinen | ½–½ | Patrascu | XI Sunway Sitges International Chess Festival 2024 - Group A | Catalan Opening: Closed Variation, Traditional Variation | |
| Dec 15, 2024 | Alexiadis | ½–½ | Koskinen | XI Sunway Sitges International Chess Festival 2024 - Group A | English Opening: Agincourt Defense, Catalan Defense Accepted | |
| Dec 13, 2024 | Song | 1–0 | Koskinen | XI Sunway Sitges International Chess Festival 2024 - Group A | Ruy Lopez: Closed, Chigorin Defense | |
| Oct 25, 2024 | Senel | ½–½ | Koskinen | 39th European Chess Club Cup | Queen's Pawn Game: London System | |
| Oct 22, 2024 | Antic | 1–0 | Koskinen | 39th European Chess Club Cup | Catalan Opening: Closed | |
| Oct 20, 2024 | Koskinen | 0–1 | Trost | 39th European Chess Club Cup | King's Indian Defense: Fianchetto Variation, Classical Variation | |
