Blackwell, John
Current rating: 1554
Record: 12-9-1
| Grand Prix Dallas-Fort Worth 2019 (modern) | starting rating: 1503 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 66 | Medford, Ronald (1463) | Won 2-0 | +171520 |
| 2modern | 287 | Thopsey, Damon (1486) | Won 2-0 | +171537 |
| 3modern | 67 | Zhou, Sean (1564) | Lost 1-2 | -171520 |
| 4modern | 170 | Alvey, Josh (1502) | Lost 1-2 | -191501 |
| 5modern | 309 | West, Brendon (1423) | Won 2-0 | +171518 |
| 6modern | 295 | Hoggatt, Zane (1525) | Draw 1-1 | 01518 |
| 7modern | 254 | Love, TJ (1498) | Won 2-0 | +181536 |
| 8modern | 173 | Malone, Nathan (1539) | Won 2-0 | +181554 |
| top | average opponent: 1500record: 5-2-1 | new rating: 1554 | ||
| Grand Prix Atlanta 2018 (modern) | starting rating: 1462 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 207 | Pirkle, Mark (1500) | Won 2-0 | +181480 |
| 2modern | 148 | Goldman, Zachary (1500) | Lost 1-2 | -171463 |
| 3modern | 538 | Chilicky, Robert (1452) | Lost 0-2 | -181445 |
| 4modern | 615 | LaVardera, Clinton (1506) | Won 2-1 | +191464 |
| 5modern | 566 | Grissom, Shelby (1475) | Won 2-1 | +181482 |
| 6modern | 293 | Upschulte, Christian (1560) | Lost 0-2 | -171465 |
| 7modern | 363 | Burke, Julian (1501) | Won 2-0 | +191484 |
| 8modern | 291 | MacDonald, Dan 8445 (1514) | Won 2-0 | +191503 |
| top | average opponent: 1501record: 5-3 | new rating: 1503 | ||
| Grand Prix Dallas-Fort Worth 2016 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 235 | Martinez, Brian (1602) | Lost 1-2 | -161484 |
| 2modern | 659 | Beardsley, Ted (1279) | Won 2-0 | +141498 |
| 3modern | 716 | O'Rourke, Nathaniel (1497) | Lost 0-2 | -181480 |
| 4modern | 886 | Johnson, KC (1472) | Won 2-1 | +181498 |
| 5modern | 535 | Ellis, Taylor (1500) | Lost 0-2 | -181480 |
| 6modern | 804 | Rios, Michael (1464) | Lost 0-2 | -181462 |
| top | average opponent: 1469record: 2-4 | new rating: 1462 | ||