| Mar 8, 2026 | Underwood | 0–1 | Arkell | Round 4: Underwood, Jon - Arkell, Keith C | English Opening: Symmetrical Variation, Three Knights, Fianchetto Variation | |
| Mar 7, 2026 | Liu | ½–½ | Underwood | Round 3: Liu, Yutong - Underwood, Jon | Dutch Defense | |
| Mar 7, 2026 | Underwood | ½–½ | Stubbs | Round 2: Underwood, Jon - Stubbs, Oliver | King's Indian Defense: Kramer Variation | |
| Feb 15, 2026 | Deboosere | 1–0 | Underwood | Round 9: Deboosere, Adam Moussa - Underwood, Jon | Dutch Defense: Staunton Gambit, Nimzowitsch Variation | |
| Feb 14, 2026 | Underwood | 1–0 | Beaurain | Round 8: Underwood, Jon - Beaurain, Yanis | English Opening: Agincourt Defense | |
| Feb 13, 2026 | Dejardin | 1–0 | Underwood | Round 7: Dejardin, Gregoire - Underwood, Jon | Dutch Defense: Fianchetto Attack | |
| Feb 13, 2026 | Underwood | 1–0 | Belhout | Round 6: Underwood, Jon - Belhout, Ahmed Zoubaier | English Opening: Agincourt Defense | |
| Feb 12, 2026 | Abidi | ½–½ | Underwood | Round 5: Abidi, Jayad - Underwood, Jon | Dutch Defense: Raphael Variation | |
| Feb 10, 2026 | Underwood | ½–½ | Brionne | Round 4: Underwood, Jon - Brionne, Thierry | English Opening: Anglo-Dutch Defense | |
| Feb 10, 2026 | Zenaidi | 0–1 | Underwood | Round 3: Zenaidi, Mokhtar - Underwood, Jon | Sicilian Defense: Lasker-Pelikan Variation | |
| Feb 9, 2026 | Underwood | 1–0 | Abdou | Round 2: Underwood, Jon - Abdou, Mohamed | English Opening: Caro-Kann Defensive System | |
| Feb 8, 2026 | Hafsa | ½–½ | Underwood | Round 1: Hafsa, Adem - Underwood, Jon | Sicilian Defense: Modern Variations | |
| Nov 2, 2025 | Vazquez Gonzalez | 1–0 | Underwood | Benidorm Chess Open B Sub-2000 2025 | Sicilian Defense | |
| Oct 31, 2025 | Reig Albero | ½–½ | Underwood | Benidorm Chess Open B Sub-2000 2025 | Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Chelyabinsk Variation | |
| Oct 30, 2025 | Underwood | 1–0 | Mulleady | Benidorm Chess Open B Sub-2000 2025 | King's Indian Defense: Kramer Variation | |
| Oct 29, 2025 | Aragon Gutierrez | ½–½ | Underwood | Benidorm Chess Open B Sub-2000 2025 | English Opening: Anglo-Dutch Defense | |
| Oct 28, 2025 | Underwood | 1–0 | Rodriguez Perez | Benidorm Chess Open B Sub-2000 2025 | English Opening: Agincourt Defense, Neo-Catalan Declined | |
| Oct 27, 2025 | Underwood | 1–0 | Matthews | Benidorm Chess Open B Sub-2000 2025 | English Opening: Agincourt Defense, Neo-Catalan Declined | |
| Oct 26, 2025 | Granholm | 0–1 | Underwood | Round 1: Granholm, Johan - Underwood, Jon | Sicilian Defense: Najdorf Variation, Lipnitsky Attack | |
| Oct 10, 2025 | Borrego Gil | ½–½ | Underwood | Benidorm Chess Open B Sub-2000 2025 | Dutch Defense: Queen's Knight Variation | |
| Feb 24, 2024 | Martyn | ½–½ | Underwood | Round 9: Martyn, Rafe - Underwood, Jon | Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation, Chelyabinsk Variation | |
| Feb 23, 2024 | Underwood | 0–1 | Waller | Round 8: Underwood, Jon - Waller, Dan | English Opening: King's English Variation, Taimanov Variation | |
| Feb 23, 2024 | Ismail | 0–1 | Underwood | Round 7: Ismail, Mohammed Aayan - Underwood, Jon | Dutch Defense: Leningrad Variation, Warsaw Variation | |
| Feb 22, 2024 | Underwood | ½–½ | McClement | Round 6: Underwood, Jon - McClement, Andrew | English Opening: Mikenas-Carls Variation | |
| Oct 21, 2023 | Grgurevic | 1–0 | Underwood | 2. Open Hvar | Sicilian Defense: Delayed Alapin Variation, with d6 | |
| Oct 19, 2023 | Daksh | ½–½ | Underwood | 2. Open Hvar | Sicilian Defense: Alapin Variation | |
| Oct 18, 2023 | Underwood | ½–½ | Lavrov | 2. Open Hvar | English Opening: Symmetrical Variation | |
| Oct 18, 2023 | Underwood | 0–1 | Kostov | 2. Open Hvar | English Opening: King's English Variation | |
| Oct 16, 2023 | Underwood | ½–½ | Dizdarevic | 2. Open Hvar | English Opening | |
| Oct 16, 2023 | Cvitan | ½–½ | Underwood | 2. Open Hvar | Dutch Defense | |
