| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 476. T Thorhallsson vs S R Mannion |
| ½-½ | 38 | 2023 | Reykjavik Open | D28 Queen's Gambit Accepted, Classical |
| 477. D Gukesh vs S R Mannion |
| 1-0 | 48 | 2023 | Menorca Open | A06 Reti Opening |
| 478. S R Mannion vs H Sorensen |
| 0-1 | 43 | 2023 | Teplice Open | B67 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 8...Bd7 |
| 479. S R Mannion vs J Roubalik |
| ½-½ | 111 | 2023 | Teplice Open | B32 Sicilian |
| 480. Sengupta vs S R Mannion |
| 1-0 | 63 | 2023 | Karel Janecek Open | A13 English |
| 481. S R Mannion vs D Radic |
| 1-0 | 44 | 2023 | Canadian Open | B27 Sicilian |
| 482. C P Wang vs S R Mannion |
| 0-1 | 50 | 2023 | Canadian Open | C44 King's Pawn Game |
| 483. S R Mannion vs B Banerjee |
| ½-½ | 21 | 2023 | Canadian Open | B80 Sicilian, Scheveningen |
| 484. R Kaufman vs S R Mannion |
| ½-½ | 43 | 2023 | Canadian Open | C43 Petrov, Modern Attack |
| 485. S R Mannion vs S Khodjimatov |
| 0-1 | 77 | 2023 | Canadian Open | C70 Ruy Lopez |
| 486. B Zhu vs S R Mannion |
| 1-0 | 51 | 2023 | Canadian Open | A45 Queen's Pawn Game |
| 487. S R Mannion vs K Ghazarian |
| ½-½ | 42 | 2023 | Fagernes Autumn | B48 Sicilian, Taimanov Variation |
| 488. Y Sokolovsky vs S R Mannion |
| 1-0 | 36 | 2023 | Fagernes Autumn | C79 Ruy Lopez, Steinitz Defense Deferred |
| 489. S R Mannion vs I Southcott-Moyers |
| ½-½ | 32 | 2023 | Fagernes Autumn | B12 Caro-Kann Defense |
| 490. M Katkov vs S R Mannion |
| ½-½ | 33 | 2023 | Fagernes Autumn | C43 Petrov, Modern Attack |
| 491. S R Mannion vs J A Gomez Aguirre |
| ½-½ | 46 | 2023 | Fagernes Autumn | C84 Ruy Lopez, Closed |
| 492. F Elsness vs S R Mannion |
| 1-0 | 81 | 2023 | Fagernes Autumn | A29 English, Four Knights, Kingside Fianchetto |
| 493. S R Mannion vs C M Arsenie |
| ½-½ | 36 | 2023 | Fagernes Autumn | B33 Sicilian |
| 494. R Vijayakumar vs S R Mannion |
| 1-0 | 35 | 2023 | Fagernes Autumn | A57 Benko Gambit |
| 495. S R Mannion vs S Vetokhin |
| 0-1 | 60 | 2023 | El Llobregat Open | B67 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 8...Bd7 |
| 496. S Dishman vs S R Mannion |
| ½-½ | 25 | 2023 | El Llobregat Open | D02 Queen's Pawn Game |
| 497. S R Mannion vs L Yordanov |
| ½-½ | 46 | 2023 | El Llobregat Open | B90 Sicilian, Najdorf |
| 498. Z H Goh vs S R Mannion |
| 0-1 | 48 | 2023 | El Llobregat Open | A57 Benko Gambit |
| 499. S R Mannion vs U A Akbas |
| 0-1 | 42 | 2023 | El Llobregat Open | B90 Sicilian, Najdorf |
| 500. S R Mannion vs A Batsukh |
| 0-1 | 37 | 2023 | El Llobregat Open | B12 Caro-Kann Defense |
Kibitzing
