Zahn, Mackenzie
Current rating: 1429
| Grand Prix Montreal 2018 (GRN limited) | starting rating: 1463 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 114 | Li, Terrence (1528) | Lost 1-2 | -171446 |
| 2sealed | 410 | Aguilar Mendoza, Luis Arturo (1482) | Lost 0-2 | -171429 |
| top | average opponent: 1505record: 0-2 | new rating: 1429 | ||
| Grand Prix Toronto 2016 (SOI standard) | starting rating: 1501 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 444 | Oliver, Tristan (1500) | Won 2-0 | +181519 |
| 2standard | 10 | Jedermann, Kieran (1518) | Lost 1-2 | -181501 |
| 3standard | 406 | Bujnowski, Cody (1438) | Lost 0-2 | -201481 |
| 4standard | 522 | MacAdoo, Liam (1464) | Lost 0-2 | -181463 |
| 5standard | 655 | Roberts, Jonathan (1418) | Won 2-0 | +171480 |
| 6standard | 478 | Ballardo, David (1529) | Lost 1-2 | -171463 |
| top | average opponent: 1478record: 2-4 | new rating: 1463 | ||
| Grand Prix Montreal 2015 (DTK limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 371 | Trahan, Jasmin (1500) | Won 2-1 | +181518 |
| 2sealed | 69 | Wong-Tremblay, Charles (1487) | Won 2-1 | +171535 |
| 3sealed | 214 | Kiefer, Jack (1536) | Won 2-0 | +181553 |
| 4sealed | 86 | Chow, Matthew (1665) | Lost 1-2 | -161537 |
| 5sealed | 218 | Morozov, Kirill (1487) | Lost 0-2 | -181519 |
| 6sealed | 167 | Tremblay, Sabryna (1517) | Lost 1-2 | -181501 |
| top | average opponent: 1532record: 3-3 | new rating: 1501 | ||