Castagna, Jonathan
Current rating: 1590
Record: 22-21
| Regional Championships Atlanta 2023 (pioneer) | starting rating: 1566 | |||
| round | table | opponent (rating) | result | Δrating |
| 1pioneer | 291 | Hardwick, Richard (1783) | Won 2-1 | +221588 |
| 2pioneer | 99 | Wienburg, Ben (1814) | Lost 0-2 | -141574 |
| 3pioneer | 333 | Kaner, Francesco (1486) | Lost 1-2 | -201554 |
| 4pioneer | 555 | Houle, Jack (1455) | Won 2-1 | +171571 |
| 5pioneer | 312 | Triebenbacher, Elliott (1570) | Lost 1-2 | -181553 |
| 6pioneer | 479 | Chiang, Jeff (1630) | Won 2-0 | +191572 |
| 7pioneer | 332 | Stednitz, David (1578) | Won 2-1 | +181590 |
| 8pioneer | 163 | Osterude, Nicholas (1645) | Won 2-1 | +191609 |
| 9pioneer | 136 | Anciaux, Matthew (1549) | Lost 0-2 | -191590 |
| top | average opponent: 1612record: 5-4 | new rating: 1590 | ||
| Grand Prix New Jersey 2020 (THB limited) | starting rating: 1588 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 277 | Kahn, Ian (1474) | Lost 0-2 | -211567 |
| 3sealed | 404 | Bartlett, Greg (1660) | Lost 1-2 | -161551 |
| 4sealed | 531 | Tobin, Frederick (1489) | Won 2-0 | +171568 |
| 5sealed | 486 | Cooper, Wade (1496) | Won 2-0 | +171585 |
| 6sealed | 291 | Steinberg, David (1546) | Lost 0-2 | -191566 |
| top | average opponent: 1533record: 2-3 | new rating: 1566 | ||
| Grand Prix Las Vegas 2019 (modern) (modern) | starting rating: 1421 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 444 | Leasure, Joshua (1505) | Won 2-0 | +201441 |
| 2modern | 327 | Vagelakos, Alexander (1514) | Lost 0-2 | -171424 |
| 3modern | 485 | Groot, Justin (1500) | Won 2-1 | +191443 |
| 4modern | 384 | Krussow, Brandon (1610) | Won 2-1 | +211464 |
| 5modern | 240 | Borakove, Steven (1661) | Won 2-0 | +221486 |
| 6modern | 108 | Song, Kai (1653) | Won 2-0 | +211507 |
| 7modern | 62 | Yarbrough, Thomas (1712) | Won 2-1 | +221529 |
| 8modern | 67 | Malcolm, Liam (1733) | Won 2-0 | +211550 |
| 9modern | 20 | Wilson, Miles (1508) | Won 2-0 | +171567 |
| 10modern | 2005 | Thompson, Geoffrey (1634) | Lost 0-2 | -161551 |
| 11modern | 2040 | Milechman, Daniel (1834) | Lost 1-2 | -131538 |
| 12modern | 2062 | DeNatale, Nicholas (1571) | Won 2-0 | +181556 |
| 13modern | 2044 | Woo, Travis (2037) | Won 2-0 | +261582 |
| 14modern | 2044 | Burns-Kirkness, Rowan (1758) | Won 2-1 | +221604 |
| 15modern | 2026 | Roy, Anjon (1709) | Lost 0-2 | -161588 |
| top | average opponent: 1663record: 11-4 | new rating: 1588 | ||
| Grand Prix New Jersey 2019 (RNA limited) | starting rating: 1423 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 136 | Miller, Byron (1385) | Won 2-0 | +171440 |
| 3sealed | 112 | Friedman, Gene (1766) | Lost 0-2 | -121428 |
| 4sealed | 207 | Robdrup, Andy (1648) | Won 2-1 | +221450 |
| 5sealed | 308 | Flores, Edgar (1834) | Lost 0-2 | -121438 |
| 6sealed | 278 | Jones, Brandon William (1474) | Lost 0-2 | -171421 |
| top | average opponent: 1621record: 2-3 | new rating: 1421 | ||
| Grand Prix Hartford 2018 (modern) | starting rating: 1450 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 154 | McGhee, Joshua (1685) | Lost 0-2 | -141436 |
| 2modern | 535 | Fiduccia, Matthew (1481) | Won 2-1 | +191455 |
| 3modern | 584 | Nauert, Jonathon (1624) | Lost 1-2 | -151440 |
| 4modern | 669 | Truppi, Mike (1484) | Lost 0-2 | -171423 |
| top | average opponent: 1568record: 1-3 | new rating: 1423 | ||
| Grand Prix Las Vegas 2017 (legacy) (legacy) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 3legacy | 435 | Gault, Dustin (1473) | Lost 1-2 | -181482 |
| 4legacy | 791 | Lotero, Ariel (1408) | Won 2-0 | +161498 |
| 5legacy | 527 | Harris, Wyatt (1508) | Lost 0-2 | -181480 |
| 6legacy | 474 | Ulanov, Denis (1746) | Lost 0-2 | -131467 |
| 7legacy | 705 | Yeh, Donny (1507) | Lost 0-2 | -171450 |
| top | average opponent: 1529record: 1-4 | new rating: 1450 | ||