Nielsen, Mark
Current rating: 1546
Record: 15-13-1
| Regional Championships Toronto 2023 (pioneer) | starting rating: 1554 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 106 | He, Chun (1500) | Won 2-1 | +171571 |
| 2pioneer | 50 | Burroughs, Kevin (1665) | Won 2-1 | +201591 |
| 3pioneer | 32 | Hoban, Liam [CAN] (1827) | Lost 0-2 | -141577 |
| 4pioneer | 42 | Qadi, Mohamad (1873) | Lost 1-2 | -131564 |
| 5pioneer | 91 | Holosko, Joel (1629) | Won 2-1 | +201584 |
| 6pioneer | 59 | Gregg, Kaya (1638) | Lost 0-2 | -171567 |
| 7pioneer | 86 | Wallace, Kelvin (1429) | Lost 1-2 | -211546 |
| top | average opponent: 1652record: 3-4 | new rating: 1546 | ||
| Grand Prix Toronto 2019 (modern) | starting rating: 1522 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 215 | Albino, Kwin (1518) | Lost 1-2 | -181504 |
| 2modern | 479 | Drolet, Jerome (1367) | Won 2-1 | +151519 |
| 3modern | 281 | Wong, Wilson (1764) | Lost 0-2 | -131506 |
| 4modern | 509 | Wilkinson, Thomas (1435) | Won 2-1 | +161522 |
| 5modern | 360 | Morrison, Adam (1458) | Lost 1-2 | -191503 |
| 6modern | 417 | Kimberley, Kyle (1482) | Won 2-1 | +181521 |
| 7modern | 293 | Wong, Philip (1415) | Won 2-0 | +161537 |
| 8modern | 229 | Becker, Paul (1498) | Won 2-1 | +171554 |
| top | average opponent: 1492record: 5-3 | new rating: 1554 | ||
| Grand Prix Toronto 2018 (modern) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 446 | Brunner, Aaron (1415) | Won 2-0 | +171481 |
| 2modern | 268 | Downing, Ian (1632) | Won 2-0 | +211502 |
| 3modern | 97 | Ashlock, Richard (1538) | Won 2-1 | +191521 |
| 4modern | 181 | Stevens, Todd (1634) | Lost 0-2 | -161505 |
| 5modern | 240 | Mallahi, Riyath (1532) | Draw 1-1 | 01505 |
| 6modern | 226 | Farand, Herve (1396) | Won 2-0 | +161521 |
| 7modern | 136 | Jean, Jenny (1545) | Won 2-1 | +191540 |
| 8modern | 81 | Clivio, Amedeo (1560) | Lost 0-2 | -181522 |
| top | average opponent: 1532record: 5-2-1 | new rating: 1522 | ||
| Grand Prix Toronto 2016 (SOI standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 1023 | Foster, Colin (1500) | Won 2-0 | +181518 |
| 2standard | 283 | Teves, Scott (1500) | Lost 0-2 | -181500 |
| 3standard | 364 | Morrill, Ethan (1513) | Lost 0-2 | -181482 |
| 4standard | 1062 | Cote, Francois (1483) | Lost 0-2 | -181464 |
| 5standard | 619 | Barna, Zoltan (1463) | Won 2-0 | +181482 |
| 6standard | 495 | Ashenden, Vincent (1487) | Lost 1-2 | -181464 |
| top | average opponent: 1491record: 2-4 | new rating: 1464 | ||