Helton, Zac
Current rating: 1524
| Grand Prix Charlotte 2016 (modern) | starting rating: 1528 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 301 | Browning, Don (1488) | Lost 1-2 | -181510 |
| 2modern | 601 | Conner, Dylan (1482) | Lost 1-2 | -191491 |
| 3modern | 1150 | McLean, Justin (1411) | Won 2-1 | +171508 |
| 4modern | 1044 | Rubin, Alec (1519) | Draw 1-1 | 01508 |
| 5modern | 776 | Adams, Nolan (1500) | Won 2-1 | +181526 |
| 6modern | 721 | Shaw, Joel (1480) | Won 2-0 | +171543 |
| 7modern | 470 | Orwig, Adam (1511) | Lost 0-2 | -191524 |
| top | average opponent: 1484record: 3-3-1 | new rating: 1524 | ||
| Grand Prix Charlotte 2015 (modern) | starting rating: 1550 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 323 | Cantrell, Carl (1509) | Lost 1-2 | -181532 |
| 2modern | 527 | Mcguckin, John (1482) | Won 2-1 | +171549 |
| 3modern | 484 | Wuerdeman, Richard A (1500) | Won 2-1 | +171566 |
| 4modern | 356 | Brown, Paul G (1518) | Lost 0-2 | -191547 |
| 5modern | 424 | Golden, Johnny (1520) | Lost 1-2 | -191528 |
| top | average opponent: 1506record: 2-3 | new rating: 1528 | ||
| Grand Prix Atlanta 2011 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 112 | Nelson, Ryan (1500) | Won 2-0 | +181518 |
| 2extended | 43 | Waugh, Brad (1517) | Won 2-1 | +181536 |
| 3extended | 2 | McLaughlin, Keith (1636) | Lost 1-2 | -161520 |
| 4extended | 146 | Heilker, David (1474) | Draw 1-1 | -11519 |
| 5extended | 144 | Sanders, Nathan (1420) | Won 2-1 | +161535 |
| 6extended | 96 | Chambers, Justin (1532) | Won 2-1 | +181553 |
| 7extended | 57 | Glantzman, Joshua (1543) | Lost 1-2 | -181535 |
| 8extended | 98 | Miller, Chris D (1390) | Won 2-0 | +151550 |
| top | average opponent: 1501record: 5-2-1 | new rating: 1550 | ||