Tatta, John
Current rating: 1546
Record: 16-13-1
| Grand Prix Baltimore 2012 (DKA standard) | starting rating: 1570 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 240 | Ricco, Tara (1500) | Lost 1-2 | -191551 |
| 2standard | 493 | Lounsberry, Jonathan (1482) | Won 2-1 | +171568 |
| 3standard | 521 | Marinkovich, George (1500) | Won 2-0 | +171585 |
| 4standard | 502 | Adamson, Bill J (1483) | Lost 1-2 | -201565 |
| 5standard | 596 | Whaley, Rory A (1499) | Lost 0-2 | -191546 |
| top | average opponent: 1493record: 2-3 | new rating: 1546 | ||
| Grand Prix Columbus 2004 (DST limited) | starting rating: 1571 | |||
| round | table | opponent (rating) | result | Δrating |
| 4sealed | 75 | Rickard, Brandon (1468) | Won 2-1 | +171588 |
| 5sealed | 9 | Braden, C. Uriah (1631) | Draw 1-1 | 01588 |
| 6sealed | 28 | Boddy, Kyle (1700) | Lost 0-2 | -161572 |
| 7sealed | 72 | Tedeschi, Michael (1554) | Lost 0-2 | -181554 |
| 8sealed | 115 | Temoney, Sean (1518) | Won 2-1 | +171571 |
| 9sealed | 75 | Gauthier, Martin-Eric (1606) | Won 2-1 | +191590 |
| 10draft | 46 | Clark, Mike (1621) | Won 2-0 | +191609 |
| 11draft | 31 | Hans, Jeff (1549) | Won 2-1 | +161625 |
| 12draft | 20 | Vogt, Jason (1530) | Lost 0-2 | -191606 |
| 13draft | 33 | Pettinger, Kevin (1453) | Lost 1-2 | -211585 |
| 14draft | 39 | De Rosa, Antonino (1773) | Lost 0-2 | -151570 |
| top | average opponent: 1582record: 5-5-1 | new rating: 1570 | ||
| Grand Prix Atlanta 2003 (8ED standard) | starting rating: 1571 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 71 | Roush, Shawn (1472) | Lost 0-2 | -201551 |
| 3standard | 128 | Cade, Antonio (1500) | Won 2-1 | +171568 |
| 4standard | 164 | Davidson, Michael C (1445) | Lost 0-2 | -201548 |
| 5standard | 171 | Bonvron, Robert (1501) | Won 2-0 | +171565 |
| 6standard | 139 | Fear, Edward (1770) | Won 2-1 | +221587 |
| 7standard | 101 | Seck, Ben (1722) | Lost 1-2 | -161571 |
| top | average opponent: 1568record: 3-3 | new rating: 1571 | ||
| Grand Prix New Orleans 2003 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 119 | Baker, Matthew (1500) | Lost 0-2 | -181482 |
| 2extended | 114 | Salonsky, Taylor (1482) | Won 2-0 | +181500 |
| 3extended | 114 | White, Donald (1466) | Won 2-0 | +171517 |
| 4extended | 86 | Benson, Mike (1502) | Won 2-0 | +181535 |
| 5extended | 59 | Kopac, Matt (1482) | Won 2-0 | +171552 |
| 6extended | 34 | Falcon, Joseph (1547) | Lost 0-2 | -181534 |
| 7extended | 63 | Woodall, Nathan (1542) | Won 2-1 | +181552 |
| 8extended | 32 | Stroud, James (1602) | Won 2-1 | +191571 |
| top | average opponent: 1515record: 6-2 | new rating: 1571 | ||