Valletta, John Joseph
Current rating: 1510
| Grand Prix Birmingham 2019 (modern) | starting rating: 1455 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 289 | Collins-Oakley, Nathan (1483) | Won 2-1 | +191474 |
| 2modern | 30 | Higgins, Gerard (1436) | Won 2-1 | +171491 |
| 3modern | 92 | Law, Tom (1838) | Won 2-0 | +241515 |
| 4modern | 58 | Meier, Michael (1913) | Lost 1-2 | -111504 |
| 5modern | 109 | Thomann, Matthias (1555) | Won 2-0 | +191523 |
| 6modern | 98 | Brown, Matt [ENG] (1763) | Won 2-0 | +221545 |
| 7modern | 46 | Sahin, Melih (1516) | Lost 1-2 | -181527 |
| 8modern | 72 | Lebrun, Benoit (1600) | Lost 1-2 | -171510 |
| top | average opponent: 1638record: 5-3 | new rating: 1510 | ||
| Grand Prix Barcelona 2019 (modern) | starting rating: 1435 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 37 | Branco De Oliveira, Ruben Davide (1500) | Won 2-0 | +201455 |
| 2modern | 271 | Llamas, Jordi (1517) | Lost 1-2 | -171438 |
| 3modern | 506 | Boyer, David (1572) | Lost 1-2 | -161422 |
| 4modern | 682 | Forcellini, Federico (1476) | Lost 0-2 | -171405 |
| 5modern | 619 | Sistig, Martin (1466) | Won 2-1 | +191424 |
| 6modern | 529 | Belmer, Yann (1745) | Won 2-0 | +241448 |
| 7modern | 402 | Harthill, Auryn (1503) | Won 2-1 | +191467 |
| 8modern | 275 | Heng, Chye Hwee (1833) | Lost 0-2 | -121455 |
| top | average opponent: 1577record: 4-4 | new rating: 1455 | ||
| Grand Prix Atlanta 2018 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 101 | Ronquillo, Voltaire (1779) | Won 2-1 | +231523 |
| 2modern | 327 | Spatz, Eric (1591) | Lost 0-2 | -171506 |
| 3modern | 515 | Davis, Ethan (1535) | Lost 0-2 | -171489 |
| 4modern | 567 | Moon, Kevin (1476) | Lost 1-2 | -191470 |
| 5modern | 671 | Ladner, Trey (1464) | Won 2-1 | +181488 |
| 6modern | 508 | Jones, Patrick (1586) | Lost 1-2 | -161472 |
| 7modern | 473 | Gross, Joe (1465) | Lost 1-2 | -181454 |
| 8modern | 404 | Hunt, Jivarre (1424) | Lost 0-2 | -191435 |
| top | average opponent: 1540record: 2-6 | new rating: 1435 | ||