Piotrowski, Barry
Current rating: 1394
| Grand Prix Milwaukee 2018 (GRN standard) | starting rating: 1397 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 404 | Li, Yuanji (1840) | Lost 1-2 | -111386 |
| 2standard | 470 | Allhiser, Bradley (1570) | Lost 0-2 | -151371 |
| 3standard | 591 | Demeny, Cole (1453) | Won 2-1 | +201391 |
| 4standard | 443 | Kelch, Nicholas (1485) | Won 2-1 | +201411 |
| 5standard | 425 | Perry, Robert (1502) | Lost 1-2 | -171394 |
| top | average opponent: 1570record: 2-3 | new rating: 1394 | ||
| Grand Prix Indianapolis 2015 (BFZ standard) | starting rating: 1447 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 327 | Carney, Benjamin (1500) | Lost 0-2 | -171430 |
| 2standard | 410 | Hunech, Phillip (1480) | Draw 1-1 | +11431 |
| 3standard | 444 | Yonke, Tyler (1489) | Lost 0-2 | -171414 |
| 4standard | 492 | Carlton, David (1434) | Lost 0-2 | -171397 |
| top | average opponent: 1476record: 0-3-1 | new rating: 1397 | ||
| Grand Prix Chicago 2014 (JOU standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 730 | Perkins, Tony (1546) | Lost 0-2 | -171483 |
| 2standard | 883 | Tripp, Ryan (1537) | Lost 1-2 | -171466 |
| 3standard | 934 | Brohman, Josh (1437) | Lost 1-2 | -191447 |
| top | average opponent: 1506record: 0-3 | new rating: 1447 | ||