Roberts, Zach
Current rating: 1406
| Grand Prix Louisville 2017 (legacy) | starting rating: 1448 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 692 | Harman, Henrique (1516) | Lost 0-2 | -171431 |
| 2legacy | 690 | Torlone, Mark (1608) | Lost 0-2 | -151416 |
| 3legacy | 966 | Iucci, Steven (1624) | Lost 0-2 | -141402 |
| 4legacy | 1022 | LaMantia, John (1444) | Won 2-1 | +191421 |
| 5legacy | 946 | Powers, Michael (1578) | Lost 1-2 | -151406 |
| top | average opponent: 1554record: 1-4 | new rating: 1406 | ||
| Grand Prix Pittsburgh 2015 (modern) | starting rating: 1502 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 595 | Combs, Floyd (1555) | Lost 0-2 | -171485 |
| 2modern | 871 | Mack, Joseph (1430) | Lost 1-2 | -191466 |
| 3modern | 1274 | Miroewski, Michael (1464) | Lost 0-2 | -181448 |
| top | average opponent: 1483record: 0-3 | new rating: 1448 | ||
| Grand Prix Charlotte 2015 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 1420 | Powell, Piper (1470) | Lost 1-2 | -191481 |
| 2modern | 1492 | Baird, John L (1482) | Won 2-0 | +181499 |
| 3modern | 1492 | Sixkiller, Gerald (1532) | Lost 1-2 | -171482 |
| 4modern | 1605 | Gray, Loren (1435) | Won 2-1 | +171499 |
| 5modern | 1279 | Long, Robert (1659) | Won 2-0 | +211520 |
| 6modern | 1228 | Dow, Colby M (1518) | Lost 0-2 | -181502 |
| top | average opponent: 1516record: 3-3 | new rating: 1502 | ||