Petch, Joshua
Current rating: 1367
Record: 7-17
| Grand Prix Brisbane 2019 (ELD standard) | starting rating: 1344 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 56 | Cunningham, Zachary (1480) | Lost 0-2 | -161328 |
| 2standard | 134 | O'kell, Jeremy (1482) | Won 2-1 | +211349 |
| 3standard | 179 | Alfonso, Kaoru (1499) | Won 2-0 | +211370 |
| 4standard | 122 | Z, Dominic (1907) | Won 2-1 | +271397 |
| 5standard | 72 | Sena, Joao (1582) | Lost 0-2 | -151382 |
| 6standard | 96 | Ditchfield, Kane (1517) | Lost 1-2 | -151367 |
| top | average opponent: 1578record: 3-3 | new rating: 1367 | ||
| Grand Prix Sydney 2019 (RNA limited) | starting rating: 1392 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 140 | Wongphan, Warot (1500) | Lost 1-2 | -161376 |
| 2sealed | 150 | George, Finlay (1500) | Lost 1-2 | -161360 |
| 3sealed | 229 | Rushton, Tomas (1471) | Lost 0-2 | -161344 |
| top | average opponent: 1490record: 0-3 | new rating: 1344 | ||
| Grand Prix Sydney 2015 (BFZ limited) | starting rating: 1404 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 305 | Lowe, Tristan (1507) | Won 2-0 | +201424 |
| 2sealed | 37 | Zhang, Edward (1652) | Lost 0-2 | -141410 |
| 3sealed | 318 | Megarrity, Angus (1415) | Lost 1-2 | -181392 |
| top | average opponent: 1525record: 1-2 | new rating: 1392 | ||
| Grand Prix Sydney 2014 (M15 limited) | starting rating: 1437 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 297 | Mimura, Haruki (1507) | Lost 0-2 | -171420 |
| 2sealed | 215 | Roffey, Benjamin (1505) | Lost 1-2 | -161404 |
| top | average opponent: 1506record: 0-2 | new rating: 1404 | ||
| Grand Prix Melbourne 2014 (BNG standard) | starting rating: 1449 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 249 | Egan, Isaac (1780) | Lost 0-2 | -121437 |
| top | record: 0-1 | new rating: 1437 | ||
| Grand Prix Brisbane 2013 (modern) | starting rating: 1466 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 147 | McKinnon, Christopher (1500) | Lost 0-2 | -171449 |
| top | record: 0-1 | new rating: 1449 | ||
| Grand Prix Sydney 2010 (SOM limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 39 | Cameron, Maitland (1500) | Lost 0-2 | -181482 |
| 2sealed | 180 | Garner, Matthew (1482) | Won 2-0 | +181500 |
| 3sealed | 131 | Tyrrell, Matthew (1499) | Lost 1-2 | -181482 |
| 4sealed | 177 | Seaton, Traci (1481) | Won 2-0 | +181500 |
| 5sealed | 107 | Nakamura, Atsushi (1604) | Lost 0-2 | -161484 |
| 6sealed | 125 | Light, Jens (1517) | Lost 0-2 | -181466 |
| 7sealed | 112 | Chen, Jack (1461) | Lost 0-2 | -181448 |
| 8sealed | 94 | Griffiths, Steven T (1449) | Won 2-1 | +181466 |
| top | average opponent: 1499record: 3-5 | new rating: 1466 | ||