Stubblefield, Chad
Current rating: 1558
| Grand Prix Dallas-Fort Worth 2019 (modern) | starting rating: 1537 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 437 | Owens, Patrick (1529) | Won 2-1 | +181555 |
| 2modern | 236 | Hohman, Christopher (1604) | Lost 0-2 | -171538 |
| 3modern | 350 | Chapman, Michael (1542) | Won 2-0 | +181556 |
| 4modern | 203 | Hoffman, Kris (1732) | Won 2-0 | +211577 |
| 5modern | 171 | Nixon, Jacob (1539) | Lost 0-2 | -191558 |
| top | average opponent: 1589record: 3-2 | new rating: 1558 | ||
| Grand Prix Houston 2018 (RIX limited) | starting rating: 1536 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 201 | Cruz, Joseph (1497) | Won 2-0 | +171553 |
| 2sealed | 162 | Sexton, Peyton (1517) | Lost 1-2 | -181535 |
| 3sealed | 209 | Moyle, Joe (1507) | Won 2-1 | +171552 |
| 4sealed | 232 | Clennon, James (1499) | Won 2-0 | +171569 |
| 5sealed | 71 | Doberne, David (1922) | Lost 0-2 | -121557 |
| 6sealed | 134 | Powell, Shelton (1425) | Lost 1-2 | -201537 |
| top | average opponent: 1561record: 3-3 | new rating: 1537 | ||
| Grand Prix San Antonio 2014 (KTK standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 140 | Dugat, Mark (1562) | Won 2-1 | +191519 |
| 2standard | 14 | Zizzo, Anthony (1562) | Won 2-0 | +191538 |
| 3standard | 147 | Schoolcraft-McCuen, Nicholas (1501) | Lost 1-2 | -191519 |
| 4standard | 145 | Funkhouser, Andrew (1547) | Won 2-1 | +191538 |
| 5standard | 164 | Herrera, Derek (1501) | Won 2-1 | +171555 |
| 6standard | 73 | Vi, Henry (1423) | Lost 1-2 | -201535 |
| 7standard | 99 | Gomez, Alonso (1572) | Won 2-0 | +181553 |
| 8standard | 56 | Sun, Qiushi (1588) | Lost 0-2 | -171536 |
| top | average opponent: 1532record: 5-3 | new rating: 1536 | ||