Coffin, Benjamin
Current rating: 1473
Record: 5-7
| Grand Prix Houston 2018 (RIX limited) | starting rating: 1508 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 202 | Brewster, John (1603) | Lost 0-2 | -171491 |
| 2sealed | 338 | Mallett, David (1414) | Lost 0-2 | -191472 |
| 3sealed | 395 | Mitchell, Jon (1463) | Won 2-1 | +181490 |
| 4sealed | 300 | Barrett, Joshua (1564) | Lost 0-2 | -171473 |
| average opponent: 1511record: 1-3 | new rating: 1473 | |||
| Grand Prix Houston 2016 (OGW standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 45 | Popps, Jason (1495) | Won 2-0 | +181518 |
| 2standard | 371 | Davila, Gilbert (1427) | Won 2-0 | +161534 |
| 3standard | 234 | Sim, Chapman (1778) | Lost 0-2 | -131521 |
| 4standard | 225 | Adams, Cody (1580) | Won 2-0 | +191540 |
| 5standard | 252 | Barker, Ari (1483) | Won 2-0 | +171557 |
| 6standard | 77 | Lowry, William (1768) | Lost 1-2 | -151542 |
| 7standard | 233 | Smith, Brett (1537) | Lost 0-2 | -181524 |
| 8standard | 369 | Chadwick, Jacob (1591) | Lost 0-2 | -161508 |
| average opponent: 1582record: 4-4 | new rating: 1508 | |||