Darby, Joseph
Current rating: 1363
| Grand Prix Pittsburgh 2018 (DOM standard) | starting rating: 1408 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 207 | Petersen, Justin (1500) | Lost 0-2 | -161392 |
| 2standard | 234 | Cumpston, Charles (1481) | Lost 0-2 | -171375 |
| 3standard | 444 | Davis, Ryan (1466) | Lost 0-2 | -161359 |
| 4standard | 434 | Kaufmann, Alanna (1417) | Won 2-1 | +191378 |
| 5standard | 380 | Chapin, Sam (1539) | Lost 0-2 | -151363 |
| top | average opponent: 1481record: 1-4 | new rating: 1363 | ||
| Grand Prix Washington DC 2017 (HOU standard) | starting rating: 1460 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 206 | Shew, Parker (1450) | Lost 0-2 | -181442 |
| 2standard | 461 | Allen, Terry (1486) | Lost 1-2 | -181424 |
| 3standard | 667 | Keates, Jason (1456) | Lost 0-2 | -171407 |
| 4standard | 755 | Aldrich, Jonathan (1420) | Won 2-1 | +181425 |
| 5standard | 656 | Lape, Brian (1462) | Lost 1-2 | -171408 |
| top | average opponent: 1455record: 1-4 | new rating: 1408 | ||
| Grand Prix Pittsburgh 2017 (AER standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 56 | Sottile, Peter (1500) | Lost 0-2 | -181482 |
| 2standard | 439 | Stiteler, Thomas (1496) | Lost 0-2 | -181464 |
| 3standard | 639 | Knorr, Jason (1463) | Won 2-0 | +181482 |
| 4standard | 572 | Quintero, Pedro (1305) | Lost 0-2 | -211461 |
| 5standard | 604 | Monitello, Anthony (1418) | Won 2-1 | +171478 |
| 6standard | 479 | May, Patrick (1450) | Lost 0-2 | -181460 |
| top | average opponent: 1438record: 2-4 | new rating: 1460 | ||