| Apr 28, 2026 | Kosten | ½–½ | Petursson | Round 9: Kosten, Anthony C. - Petursson, Margeir | English Opening: Symmetrical Variation, Ultra-Symmetrical Variation | |
| Apr 27, 2026 | Kosten | 1–0 | Sandner | Round 8: Kosten, Anthony C. - Sandner, Gunter | English Opening: King's English Variation | |
| Apr 26, 2026 | Kosten | 1–0 | Binham | Round 7: Kosten, Anthony C. - Binham, Timothy F. | King's Indian Attack | |
| Apr 25, 2026 | Knaak | ½–½ | Kosten | Round 6: Knaak, Rainer - Kosten, Anthony C. | Bogo-Indian Defense: Grünfeld Variation | |
| Apr 23, 2026 | Kosten | ½–½ | Bykhovsky | Round 5: Kosten, Anthony C. - Bykhovsky, Avigdor | English Opening: Agincourt Defense, Neo-Catalan Declined | |
| Apr 22, 2026 | Buchal | ½–½ | Kosten | Round 4: Buchal, Stephan - Kosten, Anthony C. | English Opening: Anglo-Indian Defense | |
| Apr 21, 2026 | Kosten | 1–0 | Motuz | Round 3: Kosten, Anthony C. - Motuz, Karol | English Opening: Agincourt Defense, Catalan Defense Accepted | |
| Apr 20, 2026 | Wengholm | ½–½ | Kosten | Round 2: Wengholm, Anders - Kosten, Anthony C. | King's Indian Attack, with e6 | |
| Apr 12, 2025 | Maier | 0–1 | Kosten | ESTCC65 | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| Apr 11, 2025 | Kyas | ½–½ | Kosten | ESTCC65 | Bishop's Opening: Berlin Defense | |
| Apr 10, 2025 | Kosten | 1–0 | Bowmer | ESTCC65 | English Opening: Symmetrical Variation, Ultra-Symmetrical Variation | |
| Apr 9, 2025 | Sobocanec | 0–1 | Kosten | ESTCC65 | Queen's Indian Defense: Kasparov Variation | |
| Apr 7, 2025 | Kosten | 1–0 | Woestmann | ESTCC65 | English Opening: Agincourt Defense, Neo-Catalan Declined | |
| Apr 6, 2025 | Zyla | ½–½ | Kosten | ESTCC65 | Ruy Lopez: Morphy Defense, Classical Defense Deferred | |
| Feb 26, 2025 | Kosten | ½–½ | Schmidt | World Senior Team 2025 S65 | Caro-Kann Defense: Panov Attack | |
| Feb 25, 2025 | Kosten | 1–0 | Baker | World Senior Team 2025 S65 | Ruy Lopez: Morphy Defense, Tarrasch Variation | |
| Feb 24, 2025 | Sharif | ½–½ | Kosten | World Senior Team 2025 S65 | Zukertort Opening | |
| Feb 23, 2025 | Maryasin | ½–½ | Kosten | World Senior Team 2025 S65 | Ruy Lopez: Cozio Defense | |
| Feb 21, 2025 | Kosten | ½–½ | Meister | World Senior Team 2025 S65 | Caro-Kann Defense: Panov Attack, Modern Defense, Mieses Line | |
| Feb 20, 2025 | Ceschia | ½–½ | Kosten | World Senior Team 2025 S65 | Trompowsky Attack | |
| Feb 19, 2025 | Kosten | ½–½ | Wahlbom | World Senior Team 2025 S65 | English Opening: Anglo-Indian Defense | |
| Feb 17, 2025 | Soderberg | 0–1 | Kosten | World Senior Team 2025 S65 | Ponziani Opening: Jaenisch Counterattack | |
| Jul 11, 2024 | Hentunen | 0–1 | Kosten | 65-1 | Catalan Opening: Open Defense | |
| Jul 10, 2024 | Kosten | 1–0 | Stebbings | 65-1 | English Opening: Symmetrical Variation, Rubinstein Variation | |
| Jul 9, 2024 | Messa | ½–½ | Kosten | 65-1 | Bogo-Indian Defense: Wade-Smyslov Variation | |
| Jul 7, 2024 | Kosten | ½–½ | Mikhalevski | 65-1 | English Opening: Agincourt Defense, Neo-Catalan Declined | |
| Jul 6, 2024 | Roos | ½–½ | Kosten | 65-1 | King's Indian Attack | |
| Jul 5, 2024 | Kosten | 1–0 | Plachetka | 65-1 | English Opening: Symmetrical Variation, Three Knights, Fianchetto Variation | |
| Jul 4, 2024 | Raupp | ½–½ | Kosten | 65-1 | Nimzo-Indian Defense: Kmoch Variation | |
| Jul 3, 2024 | Kosten | 1–0 | Miltner | 65-1 | Philidor Defense: Lion Variation | |
| Jul 2, 2024 | Holst | 0–1 | Kosten | 65-1 | Bogo-Indian Defense: Nimzowitsch Variation | |
| May 15, 2024 | Vujakovic | ½–½ | Kosten | European Senior Team Chess Championship 2024 - Section 65 + | Ruy Lopez: Cozio Defense | |
| May 14, 2024 | Hardicsay | 0–1 | Kosten | European Senior Team Chess Championship 2024 - Section 65 + | Bogo-Indian Defense: Grünfeld Variation | |
| May 13, 2024 | Binham | ½–½ | Kosten | European Senior Team Chess Championship 2024 - Section 65 + | Ruy Lopez: Morphy Defense, Modern Steinitz Defense | |
| May 12, 2024 | Roos | 1–0 | Kosten | European Senior Team Chess Championship 2024 - Section 65 + | Bogo-Indian Defense: Exchange Variation | |
| May 11, 2024 | Kosten | ½–½ | Mikhalchishin | European Senior Team Chess Championship 2024 - Section 65 + | English Opening: King's English Variation, Four Knights Variation, Fianchetto Line | |
| May 10, 2024 | Plachetka | ½–½ | Kosten | European Senior Team Chess Championship 2024 - Section 65 + | Bogo-Indian Defense: Exchange Variation | |
| May 9, 2024 | Kosten | 1–0 | Werner | European Senior Team Chess Championship 2024 - Section 65 + | English Opening: King's English Variation | |
| May 8, 2024 | Glienke | ½–½ | Kosten | European Senior Team Chess Championship 2024 - Section 65 + | Scotch Game: Schmidt Variation | |
| Jul 20, 2023 | Bachmann | ½–½ | Kosten | European Senior Team Chess Championship 2023 65+ | Catalan Opening: Open Defense, Alekhine Variation | |
| Jul 19, 2023 | Legky | ½–½ | Kosten | European Senior Team Chess Championship 2023 65+ | Bogo-Indian Defense: Nimzowitsch Variation | |
| Jul 18, 2023 | Kosten | ½–½ | Tompa | European Senior Team Chess Championship 2023 65+ | King's Indian Attack | |
| Jul 17, 2023 | Werner | ½–½ | Kosten | European Senior Team Chess Championship 2023 65+ | Ruy Lopez: Morphy Defense, Cozio Defense | |
| Jul 15, 2023 | Kosten | 1–0 | Wahlbom | European Senior Team Chess Championship 2023 65+ | English Opening: Symmetrical Variation, Hedgehog Defense | |
| Jul 14, 2023 | Plachetka | ½–½ | Kosten | European Senior Team Chess Championship 2023 65+ | Bogo-Indian Defense: Nimzowitsch Variation | |
| Jul 13, 2023 | Kosten | ½–½ | Lederman | European Senior Team Chess Championship 2023 65+ | Caro-Kann Defense: Accelerated Panov Attack, Modern Variation | |
| May 2, 2022 | Kosten | 1–0 | Purton | 4NCL Main League 1-2 | English Opening: Symmetrical Variation, Rubinstein Variation | |
| Apr 30, 2022 | Kosten | ½–½ | Gormally | 4NCL Main League 1-2 | English Opening: King's English Variation, Four Knights Variation, Fianchetto Line | |