| 9 ago 2026 | Williams, Simon K 2438 | McShane, Luke J 2597 | 0-1 | E17 Queen's Indian Defense: Classical Variation, Polugaevsky Gambit | 2026 British Chess Championships: Championship | 62 | Ver |
| 8 ago 2026 | Bazakutsa, Svyatoslav 2488 | Williams, Simon K 2438 | 0-1 | A20 English Opening: King's English Variation | 2026 British Chess Championships: Championship | 55 | Ver |
| 7 ago 2026 | Williams, Simon K 2438 | Czopor, Maciej 2455 | 1-0 | D41 Queen's Gambit Declined: Semi-Tarrasch Defense, Exchange Variation | 2026 British Chess Championships: Championship | 30 | Ver |
| 6 ago 2026 | Williams, Simon K 2438 | He, Tom Junde 2266 | 1-0 | A08 King's Indian Attack: French Variation | 2026 British Chess Championships: Championship | 39 | Ver |
| 5 ago 2026 | Ledger, Andrew J 2312 | Williams, Simon K 2438 | ½-½ | A04 Zukertort Opening: Pirc Invitation | 2026 British Chess Championships: Championship | 36 | Ver |
| 4 ago 2026 | Williams, Simon K 2438 | Waldhausen Gordon, Frederick 2455 | ½-½ | A46 Yusupov-Rubinstein System | 2026 British Chess Championships: Championship | 36 | Ver |
| 3 ago 2026 | Han, Qixiang 2239 | Williams, Simon K 2438 | ½-½ | C00 French Defense: Schlechter Variation | 2026 British Chess Championships: Championship | 36 | Ver |
| 2 ago 2026 | Williams, Simon K 2455 | Bezuidenhout, Roland 2284 | 1-0 | A06 Zukertort Opening | 2026 British Chess Championships: Championship | 38 | Ver |
| 1 ago 2026 | Elgar, Tim 2166 | Williams, Simon K 2455 | 0-1 | A46 Indian Defense: Wade-Tartakower Defense | 2026 British Chess Championships: Championship | 42 | Ver |
| 23 jul 2026 | Williams, Simon K 2455 | Kolani, Arjun 2137 | ½-½ | E60 Indian Defense: Anti-Grünfeld, Basman-Williams Attack | Sussex University Masters | 30 | Ver |
| 23 jul 2026 | Khoury, Theo 2172 | Williams, Simon K 2455 | ½-½ | C11 French Defense: Steinitz Variation, Boleslavsky Variation | Sussex University Masters | 39 | Ver |
| 22 jul 2026 | Williams, Simon K 2455 | Zilka, Stepan 2526 | ½-½ | A46 Torre Attack: Classical Defense | Sussex University Masters | 33 | Ver |
| 22 jul 2026 | Southcott-Moyers, Indy 2208 | Williams, Simon K 2455 | 0-1 | A84 Dutch Defense: Classical Variation | Sussex University Masters | 35 | Ver |
| 21 jul 2026 | Williams, Simon K 2455 | Shearsby, Jude 2243 | ½-½ | E61 King's Indian Defense: Smyslov Variation | Sussex University Masters | 17 | Ver |
| 4 may 2026 | Williams, Simon K 2455 | Nawalaniec, Adam 2311 | 1-0 | B95 Sicilian Defense: Najdorf Variation | 4NCL Division 1 2025-2026 | 31 | Ver |
| 3 may 2026 | Williams, Simon K 2455 | Rakotomaharo, Fy Antenaina 2441 | ½-½ | A17 English Opening: Anglo-Indian Defense | 4NCL Division 1 2025-2026 | 81 | Ver |
| 2 may 2026 | Gallana, Marco 2239 | Williams, Simon K 2455 | ½-½ | A90 Dutch Defense: Classical Variation | 4NCL Division 1 2025-2026 | 35 | Ver |
| 31 mar 2026 | Williams, Simon K 2443 | Sterck, Arno 2252 | 1-0 | A00 Ware Opening | Reykjavik Open 2026 | 46 | Ver |
| 30 mar 2026 | Birkisson, Bardur Orn 2207 | Williams, Simon K 2443 | 0-1 | A80 Dutch Defense: Raphael Variation | Reykjavik Open 2026 | 55 | Ver |
| 29 mar 2026 | Williams, Simon K 2443 | Andersen, Mads 2562 | 0-1 | D27 Queen's Gambit Accepted: Classical Defense, Russian Gambit | Reykjavik Open 2026 | 27 | Ver |