Prentiss, Robert
Current rating: 1404
| Grand Prix Hartford 2018 (modern) | starting rating: 1414 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 81 | Kelley, Austin (1467) | Lost 0-2 | -171397 |
| 2modern | 502 | Solda, Benjamin (1419) | Won 2-0 | +181415 |
| 3modern | 633 | Bergerac, Michael (1638) | Lost 0-2 | -141401 |
| 4modern | 703 | Small, Andrew (1481) | Won 2-1 | +201421 |
| 5modern | 493 | Zibbideo, Michael (1498) | Lost 1-2 | -171404 |
| top | average opponent: 1501record: 2-3 | new rating: 1404 | ||
| Grand Prix Pittsburgh 2015 (modern) | starting rating: 1445 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 742 | Gentile, Christopher (1500) | Won 2-0 | +191464 |
| 2modern | 586 | Farrell, Michael (1504) | Lost 0-2 | -171447 |
| 3modern | 867 | Oravec, Daniel (1433) | Lost 0-2 | -191428 |
| 4modern | 1064 | Brieger, John (1621) | Lost 0-2 | -141414 |
| top | average opponent: 1514record: 1-3 | new rating: 1414 | ||
| Grand Prix Charlotte 2015 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 786 | Thomas, Todd (1500) | Won 2-0 | +181518 |
| 2modern | 723 | Lenoir, Joseph G (1518) | Lost 0-2 | -181500 |
| 3modern | 1014 | Gangl, Cory (1504) | Lost 1-2 | -181482 |
| 4modern | 1091 | Martin, Joshua (1439) | Lost 1-2 | -191463 |
| 5modern | 998 | Spahr, Richard (1463) | Won 2-1 | +181481 |
| 6modern | 928 | Anderson, David (1454) | Lost 0-2 | -181463 |
| 7modern | 770 | Moyer, Ian (1463) | Lost 0-2 | -181445 |
| top | average opponent: 1477record: 2-5 | new rating: 1445 | ||