Teskey, Donny R
Current rating: 1609
| Grand Prix Toronto 2012 (modern) | starting rating: 1559 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 152 | Fraser, Charles (1500) | Won 2-1 | +171576 |
| 2modern | 127 | Song, John (1500) | Lost 1-2 | -201556 |
| 3modern | 322 | Van der Ploeg, Kris (1499) | Won 2-1 | +171573 |
| 4modern | 250 | Richard, Pascal (1513) | Won 2-1 | +171590 |
| 5modern | 167 | Shen, Justin (1534) | Won 2-1 | +171607 |
| 6modern | 92 | Roias, Steven (1541) | Won 2-1 | +171624 |
| 7modern | 88 | Brooks, Daniel (1661) | Won 2-1 | +191643 |
| 8modern | 49 | Johnson, Jon (1610) | Lost 1-2 | -191624 |
| 9modern | 63 | Carvalho, Pedro (1785) | Lost 0-2 | -151609 |
| top | average opponent: 1571record: 6-3 | new rating: 1609 | ||
| Grand Prix Montreal 2011 (M12 limited) | starting rating: 1525 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 433 | Dagenais, Patrick (1500) | Won 2-0 | +171542 |
| 2sealed | 417 | Reid, Edward D (1518) | Won 2-0 | +181560 |
| 3sealed | 423 | Miller, Dylan (1586) | Lost 1-2 | -181542 |
| 4sealed | 492 | Jette, Jonathan (1540) | Won 2-1 | +181560 |
| 5sealed | 435 | Onland, Jesse (1494) | Won 2-0 | +171577 |
| 6sealed | 410 | Robins, Scott (1528) | Lost 0-2 | -191558 |
| 7sealed | 412 | Depass, Philippe (1552) | Won 2-0 | +181576 |
| 8sealed | 392 | Dufour, Marc (1610) | Lost 1-2 | -171559 |
| top | average opponent: 1541record: 5-3 | new rating: 1559 | ||
| Grand Prix Toronto 2010 (SOM limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 411 | Roy, Jamie (1500) | Lost 0-2 | -181482 |
| 2sealed | 632 | Sidders, Jesse R (1482) | Won 2-0 | +181500 |
| 3sealed | 561 | Hackett, Chris (1467) | Won 2-0 | +171517 |
| 4sealed | 506 | Vasko, Brandon (1518) | Won 2-0 | +181535 |
| 5sealed | 391 | Schnayer, David (1733) | Won 2-0 | +221557 |
| 6sealed | 362 | Toussaint, Francis (1782) | Lost 0-2 | -141543 |
| 7sealed | 402 | Goodwin, Michael (1538) | Lost 0-2 | -181525 |
| top | average opponent: 1574record: 4-3 | new rating: 1525 | ||