Petts, Robert
Current rating: 1546
| Grand Prix Atlanta 2017 (XLN standard) | starting rating: 1575 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 185 | Muller, Brian (1498) | Won 2-0 | +161591 |
| 2standard | 248 | Johnson, Patricia (1430) | Lost 0-2 | -211570 |
| 3standard | 369 | Grimes, Rick (1521) | Won 2-1 | +171587 |
| 4standard | 301 | Munday, Michael (1552) | Lost 0-2 | -181569 |
| 5standard | 383 | Jeffries, Richard (1545) | Won 2-0 | +171586 |
| 6standard | 257 | Moe, Philip (1466) | Lost 1-2 | -201566 |
| 7standard | 443 | Justice, Adam (1443) | Lost 1-2 | -201546 |
| top | average opponent: 1494record: 3-4 | new rating: 1546 | ||
| Grand Prix New Jersey 2014 (legacy) | starting rating: 1552 | |||
| round | table | opponent (rating) | result | Δrating |
| 3legacy | 959 | Scacca, Ryan (1536) | Won 2-0 | +181570 |
| 4legacy | 824 | Flynn, Evan (1506) | Lost 1-2 | -191551 |
| 5legacy | 755 | Akpinar, Tim (1812) | Won 2-1 | +221573 |
| 6legacy | 715 | Regan, Christian (1554) | Won 2-1 | +181591 |
| 7legacy | 619 | Tibbetts, Jeremy (1655) | Lost 0-2 | -171574 |
| 8legacy | 625 | Kohanim, Michael (1564) | Lost 1-2 | -181556 |
| 9legacy | 681 | Wilbur, Nick (1591) | Won 2-1 | +191575 |
| top | average opponent: 1603record: 4-3 | new rating: 1575 | ||
| Grand Prix Richmond 2014 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 1167 | Hilton, Ashton (1500) | Won 2-1 | +181518 |
| 2modern | 1317 | Anderson, Tyler (1526) | Won 2-1 | +181536 |
| 3modern | 1178 | Bevenour, Matthew (1496) | Lost 0-2 | -191517 |
| 4modern | 1222 | Branan, Nick (1480) | Lost 0-2 | -181499 |
| 5modern | 1357 | Chiappalone, Anthony (1502) | Lost 1-2 | -181481 |
| 6modern | 1442 | Crosmun, Patrick (1480) | Won 2-0 | +181499 |
| 7modern | 1319 | Black, Samir (1482) | Won 2-0 | +171516 |
| 8modern | 1226 | Vo, Thomas (1486) | Won 2-1 | +181534 |
| 9modern | 1162 | Hawron, Richard (1548) | Won 2-0 | +181552 |
| top | average opponent: 1500record: 6-3 | new rating: 1552 | ||