Cowan, John William
Current rating: 1544
| Grand Prix Montreal 2019 (ELD limited) | starting rating: 1566 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 121 | Hennick, Michael (1518) | Lost 0-2 | -191547 |
| 2sealed | 340 | Pritchard, Trevor (1480) | Won 2-0 | +171564 |
| 3sealed | 266 | Pennington, Tyler (1484) | Lost 0-2 | -201544 |
| top | average opponent: 1494record: 1-2 | new rating: 1544 | ||
| Grand Prix Costa Rica 2012 (M13 limited) | starting rating: 1536 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 103 | Barahona Gomez, Danny (1500) | Won 2-0 | +171553 |
| 3sealed | 72 | Villalobos, Hector (1483) | Won 2-1 | +171570 |
| 4sealed | 101 | Avila Chacon, Jonathan (1500) | Lost 0-2 | -191551 |
| 5sealed | 114 | Ledezma Lopez, Andy (1483) | Won 2-0 | +171568 |
| 6sealed | 61 | Castro, Mario (1500) | Won 2-0 | +161584 |
| 7sealed | 48 | Abarca, Ricardo (1557) | Lost 1-2 | -181566 |
| top | average opponent: 1504record: 4-2 | new rating: 1566 | ||
| Grand Prix Montreal 2007 (Time Spiral block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 120 | Morelli, Mike (1500) | Won 2-1 | +181518 |
| 2block | 41 | Hurd, Adam (1613) | Won 2-0 | +201538 |
| 3block | 109 | Tse, Felix (1438) | Won 2-0 | +161554 |
| 4block | 13 | Maaten, Rogier (1913) | Won 2-1 | +241578 |
| 5block | 22 | Ruel, Olivier (2135) | Lost 0-2 | -91569 |
| 6block | 85 | Tremblay, Sebastien (1553) | Lost 0-2 | -181551 |
| 7block | 82 | Cardin, Guillaume (1720) | Lost 0-2 | -151536 |
| top | average opponent: 1696record: 4-3 | new rating: 1536 | ||