Howell, Zachary
Current rating: 1487
| Grand Prix Oakland 2019 (modern) | starting rating: 1502 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 73 | Shanahan, Mitchell (1562) | Lost 0-2 | -161486 |
| 2modern | 409 | Reynolds, Canyon (1481) | Won 2-0 | +171503 |
| 3modern | 359 | Dolan, Brian (1568) | Lost 1-2 | -161487 |
| top | average opponent: 1537record: 1-2 | new rating: 1487 | ||
| Grand Prix Sacramento 2018 (M19 limited) | starting rating: 1465 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 8 | Brumer, Benjamin (1500) | Won 2-1 | +191484 |
| 2sealed | 120 | Santos, Trini (1401) | Won 2-0 | +161500 |
| 3sealed | 246 | Parrish, Joby (1908) | Won 2-0 | +251525 |
| 4sealed | 100 | Nguyen, David (1837) | Lost 1-2 | -121513 |
| 5sealed | 252 | Cheng, Aaron (1724) | Won 2-0 | +221535 |
| 6sealed | 133 | Silva, Austin (1578) | Lost 1-2 | -171518 |
| 7sealed | 109 | Zlotoiabko, Boris (1680) | Lost 1-2 | -161502 |
| top | average opponent: 1661record: 4-3 | new rating: 1502 | ||
| Grand Prix Sacramento 2014 (THS limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 1126 | Jacobs, John (1500) | Lost 0-2 | -181482 |
| 2sealed | 1265 | Clements, Thomas (1557) | Won 2-1 | +191501 |
| 3sealed | 1237 | Egan, Bryce (1500) | Lost 0-2 | -181483 |
| 4sealed | 1229 | Rumenapp, Chris (1482) | Lost 0-2 | -181465 |
| top | average opponent: 1510record: 1-3 | new rating: 1465 | ||