Diffey, David
Current rating: 1480
Record: 4-5
| Grand Prix Oklahoma City 2017 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 85 | Reyes, Kenneth (1500) | Won 2-0 | +181518 |
| 2modern | 236 | Hurst, Kevin (1500) | Lost 0-2 | -181500 |
| 3modern | 541 | Buccafusca, Lucas (1567) | Lost 1-2 | -171483 |
| 4modern | 536 | Jones, Mason (1482) | Lost 0-2 | -181465 |
| 5modern | 608 | Terry, Heath (1430) | Won 2-1 | +171482 |
| 6modern | 506 | Prentice, Aaron (1504) | Won 2-0 | +191501 |
| 7modern | 395 | LaSalle, Joe (1502) | Won 2-1 | +181519 |
| 8modern | 257 | Henderson II, LaVance (1551) | Lost 0-2 | -181501 |
| 9modern | 339 | Peters, Patrick (1337) | Lost 0-2 | -211480 |
| average opponent: 1486record: 4-5 | new rating: 1480 | |||