| 9 ago 2026 | Fitzsimons, David 2302 | Potter, John M 2092 | ½-½ | C05 French Defense: Tarrasch Variation, Closed Variation | 2026 British Chess Championships: Championship | 32 | Ver |
| 8 ago 2026 | Jermy, Jaden 2012 | Fitzsimons, David 2302 | 0-1 | A07 King's Indian Attack | 2026 British Chess Championships: Championship | 33 | Ver |
| 7 ago 2026 | Fitzsimons, David 2302 | Tahmankar, Mandar 2085 | 0-1 | B10 Caro-Kann Defense: Two Knights Attack | 2026 British Chess Championships: Championship | 43 | Ver |
| 6 ago 2026 | Lentzos, Ioanis 2110 | Fitzsimons, David 2302 | 1-0 | E81 King's Indian Defense: Sämisch Variation, Bobotsov-Korchnoi-Petrosian Variation | 2026 British Chess Championships: Championship | 42 | Ver |
| 5 ago 2026 | Fitzsimons, David 2302 | Kolani, Arjun 2158 | 0-1 | C26 Vienna Game: Stanley Variation | 2026 British Chess Championships: Championship | 59 | Ver |
| 4 ago 2026 | Majeed, Haroon 2153 | Fitzsimons, David 2292 | ½-½ | C02 French Defense: Advance Variation, Paulsen Attack | 2026 British Chess Championships: Championship | 55 | Ver |
| 3 ago 2026 | Fitzsimons, David 2292 | Ghasi, Ameet K 2494 | 0-1 | B50 Sicilian Defense: Modern Variations | 2026 British Chess Championships: Championship | 34 | Ver |
| 2 ago 2026 | Terler, Bohdan 2035 | Fitzsimons, David 2317 | 0-1 | B20 Sicilian Defense | 2026 British Chess Championships: Championship | 41 | Ver |
| 1 ago 2026 | Fitzsimons, David 2317 | Blackford, Ross 2077 | ½-½ | B15 Caro-Kann Defense: Tartakower Variation | 2026 British Chess Championships: Championship | 66 | Ver |
| 22 jul 2026 | Fitzsimons, David 2317 | Khoury, Theo 2172 | 0-1 | B54 Sicilian Defense: Modern Variations, Main Line | Sussex University Masters | 58 | Ver |
| 21 jul 2026 | Fitzsimons, David 2317 | Kothari, Jai 2160 | 1-0 | C55 Italian Game: Two Knights Defense, Modern Bishop's Opening | Sussex University Masters | 33 | Ver |
| 12 jun 2026 | Zilka, Stepan 2526 | Fitzsimons, David 2317 | 1-0 | D21 Queen's Gambit Accepted: Gunsberg Defense | Sussex University Masters | 34 | Ver |
| 4 may 2026 | Larkin, Vladyslav 2493 | Fitzsimons, David 2320 | 1-0 | A07 King's Indian Attack, with e6 | 4NCL Division 1 2025-2026 | 40 | Ver |
| 3 may 2026 | Fitzsimons, David 2320 | Boswell, Jacob Connor 2238 | 0-1 | B27 Sicilian Defense: Katalimov Variation | 4NCL Division 1 2025-2026 | 68 | Ver |
| 2 may 2026 | Fava, Lorenzo 2368 | Fitzsimons, David 2320 | 1-0 | D00 Queen's Pawn Game: Accelerated London System | 4NCL Division 1 2025-2026 | 58 | Ver |
| 22 feb 2026 | Fitzsimons, David 2309 | Melaugh, Shane 2191 | 1-0 | B40 Sicilian Defense: French Variation | DCU Open 2026 | 35 | Ver |
| 22 feb 2026 | Sidney, Will 2020 | Fitzsimons, David 2309 | ½-½ | B03 Alekhine Defense: Exchange Variation | DCU Open 2026 | 100 | Ver |
| 8 feb 2026 | Ledger, Dave J 2138 | Fitzsimons, David 2309 | 0-1 | B04 Alekhine Defense: Modern Variation, Alburt Variation | 4NCL Division 1 2025-2026 | 30 | Ver |
| 7 feb 2026 | Fitzsimons, David 2309 | Murawski, Jan 2200 | 1-0 | C54 Italian Game: Classical Variation, Greco Gambit, Traditional Line | 4NCL Division 1 2025-2026 | 43 | Ver |