O'Mahony, Joshua
Current rating: 1496
Record: 11-14
| Grand Prix Birmingham 2019 (modern) | starting rating: 1474 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 59 | Nicoll, Graeme (1500) | Won 2-0 | +181492 |
| 2modern | 177 | Evans, Leon (1508) | Won 2-0 | +181510 |
| 3modern | 188 | Richards, Branoc (1654) | Lost 1-2 | -151495 |
| 4modern | 239 | Quentin, Fumoux (1519) | Won 2-0 | +181513 |
| 5modern | 151 | Van Roey, Glenn (1542) | Lost 1-2 | -171496 |
| 6modern | 252 | Griffiths, Brogan (1525) | Won 2-1 | +191515 |
| 7modern | 190 | Anderson, Cameron (1494) | Lost 1-2 | -191496 |
| top | average opponent: 1535record: 4-3 | new rating: 1496 | ||
| Grand Prix London 2019 (WAR sealed) | starting rating: 1444 | |||
| round | table | opponent (rating) | result | Δrating |
| A1sealed | 146 | Phillips, Christopher (1576) | Won 2-1 | +201464 |
| A2sealed | 122 | Nguyen, Lan (1735) | Won 2-1 | +231487 |
| A3sealed | 84 | Watts, Zach (1685) | Lost 0-2 | -151472 |
| A4sealed | 76 | Camilleri, Daniel (1408) | Lost 1-2 | -191453 |
| B1sealed | 1090 | Diekjobst, Lukas (1626) | Lost 0-2 | -151438 |
| C1sealed | 312 | Farto, Vasco (1512) | Won 2-0 | +201458 |
| C2sealed | 82 | Bjorkmann, Carsten (1527) | Won 2-0 | +191477 |
| C3sealed | 106 | Hulten, Alexander (1845) | Won 2-1 | +241501 |
| C4sealed | 46 | Scaramelli, Ugo (1770) | Lost 0-2 | -131488 |
| C5sealed | 121 | Pollone, Lorenzo (1686) | Lost 1-2 | -141474 |
| top | average opponent: 1637record: 5-5 | new rating: 1474 | ||
| Grand Prix Birmingham 2018 (leg) (legacy) | starting rating: 1447 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 144 | Korhonen, Niko (1622) | Lost 0-2 | -141433 |
| 2legacy | 414 | Mason, Joe (1482) | Won 2-1 | +181451 |
| 3legacy | 435 | Griffiths, Matt (1504) | Lost 0-2 | -171434 |
| 4legacy | 520 | Efraimidis, Aris (1621) | Won 2-0 | +221456 |
| 5legacy | 434 | Gaieski, Ethan (1784) | Lost 1-2 | -121444 |
| top | average opponent: 1603record: 2-3 | new rating: 1444 | ||
| Grand Prix Utrecht 2015 (MM2 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 2251 | Schnack, Stefan (1500) | Lost 1-2 | -181482 |
| 2sealed | 2290 | Kopp, Daniel (1449) | Lost 0-2 | -191463 |
| 3sealed | 2442 | De Waegeneer, Joran (1572) | Lost 0-2 | -161447 |
| top | average opponent: 1507record: 0-3 | new rating: 1447 | ||