| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 501. M Alinasab vs S R Mannion |
| 1-0 | 27 | 2023 | El Llobregat Open | C28 Vienna Game |
| 502. S R Mannion vs V Nevednichy |
| 0-1 | 60 | 2024 | Reykjavik Open | B67 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 8...Bd7 |
| 503. S R Mannion vs J Omarsson |
| 1-0 | 40 | 2024 | Reykjavik Open | B33 Sicilian |
| 504. Y Jin vs S R Mannion |
| 1-0 | 57 | 2024 | Reykjavik Open | A57 Benko Gambit |
| 505. G Mammadzada vs S R Mannion |
| 1-0 | 68 | 2024 | Reykjavik Open | C79 Ruy Lopez, Steinitz Defense Deferred |
| 506. S R Mannion vs A Botez |
| ½-½ | 71 | 2024 | Reykjavik Open | C03 French, Tarrasch |
| 507. G Nasuta vs S R Mannion |
| 1-0 | 40 | 2024 | Menorca Open | C50 Giuoco Piano |
| 508. S R Mannion vs S Rohit |
| 0-1 | 50 | 2024 | Teplice Open | B90 Sicilian, Najdorf |
| 509. S R Mannion vs Y Yaniv |
| 0-1 | 31 | 2024 | Teplice Open | B45 Sicilian, Taimanov |
| 510. A Lutsko vs S R Mannion |
 | 1-0 | 40 | 2024 | British Championship | C79 Ruy Lopez, Steinitz Defense Deferred |
| 511. S R Mannion vs R Palliser |
| ½-½ | 26 | 2024 | British Championship | B93 Sicilian, Najdorf, 6.f4 |
| 512. J Merriman vs S R Mannion |
| 1-0 | 22 | 2024 | British Championship | D26 Queen's Gambit Accepted |
| 513. S R Mannion vs R Rida |
| ½-½ | 75 | 2024 | British Championship | C78 Ruy Lopez |
| 514. O Verbytski vs S R Mannion |
 | 0-1 | 65 | 2024 | British Championship | C54 Giuoco Piano |
| 515. S R Mannion vs R Evans |
| ½-½ | 45 | 2024 | British Championship | C05 French, Tarrasch |
| 516. D Shafi vs S R Mannion |
| ½-½ | 64 | 2024 | British Championship | D20 Queen's Gambit Accepted |
| 517. S R Mannion vs J Murawski |
| 1-0 | 46 | 2024 | British Championship | C84 Ruy Lopez, Closed |
| 518. J Richardson vs S R Mannion |
| ½-½ | 16 | 2024 | British Championship | D23 Queen's Gambit Accepted |
| 519. S R Mannion vs M Boyer |
| 0-1 | 74 | 2025 | Cappelle Open | B09 Pirc, Austrian Attack |
| 520. P Laurent-Paoli vs S R Mannion |
| ½-½ | 79 | 2025 | Cappelle Open | C96 Ruy Lopez, Closed |
| 521. L Yankelevich vs S R Mannion |
| 1-0 | 50 | 2025 | Reykjavik Open | C96 Ruy Lopez, Closed |
| 522. A Puranik vs S R Mannion |
| 1-0 | 41 | 2025 | Menorca Open | C97 Ruy Lopez, Closed, Chigorin |
Kibitzing
