Halbert, Charles
Current rating: 1442
Record: 4-8
| Grand Prix Sacramento 2018 (M19 limited) | starting rating: 1448 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 420 | Caton, Miles (1513) | Won 2-0 | +191467 |
| 2sealed | 179 | Hentges, Stephen (1504) | Lost 0-2 | -171450 |
| 3sealed | 461 | Long, Craig (1503) | Won 2-0 | +191469 |
| 4sealed | 304 | Tan, James (1763) | Lost 1-2 | -131456 |
| 5sealed | 449 | Hunt, Leighann (1668) | Lost 1-2 | -141442 |
| top | average opponent: 1590record: 2-3 | new rating: 1442 | ||
| Grand Prix Las Vegas 2018 (limited) (DOM limited) | starting rating: 1463 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 544 | Boldan, Eric (1495) | Won 2-1 | +191482 |
| 2sealed | 207 | Jones, Phillip (1535) | Lost 1-2 | -171465 |
| 3sealed | 534 | Maxey, Scott (1474) | Won 2-0 | +181483 |
| 4sealed | 542 | Abramowitz-Reif, Max (1539) | Lost 0-2 | -171466 |
| 5sealed | 587 | Rigatti, Jamie (1466) | Lost 1-2 | -181448 |
| top | average opponent: 1502record: 2-3 | new rating: 1448 | ||
| Grand Prix Las Vegas 2018 (modern) (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 330 | Doan, Lukas (1446) | Lost 1-2 | -191481 |
| 2modern | 750 | Pollack, Paul (1481) | Lost 1-2 | -181463 |
| top | average opponent: 1463record: 0-2 | new rating: 1463 | ||