Mashak, Jacob
Current rating: 1433
Record: 4-8
| Grand Prix Seattle 2018 (legacy) (legacy) | starting rating: 1487 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 426 | Alves Dos Santos, Matheus (1465) | Lost 1-2 | -191468 |
| 2legacy | 508 | Liberto, Lance (1489) | Lost 0-2 | -171451 |
| 3legacy | 698 | Gill, Harjeevan (1464) | Lost 0-2 | -181433 |
| average opponent: 1473record: 0-3 | new rating: 1433 | |||
| Grand Prix San Jose 2017 (AER limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 417 | Myles, Zack (1544) | Lost 0-2 | -171483 |
| 2sealed | 619 | Brooks, Eric (1384) | Won 2-1 | +161499 |
| 3sealed | 612 | Young, Chad (1499) | Lost 0-2 | -181481 |
| 4sealed | 706 | Hitz, Ben (1484) | Won 2-0 | +181499 |
| 5sealed | 476 | Janasiewicz, Jason (1756) | Won 2-0 | +231522 |
| 6sealed | 269 | Corrente, Chris (1625) | Lost 0-2 | -161506 |
| 7sealed | 530 | Grino, Nick (1505) | Won 2-0 | +181524 |
| 8sealed | 475 | Garsten, Niall (1484) | Lost 1-2 | -191505 |
| 9sealed | 386 | Wolfe, Andrew (1502) | Lost 0-2 | -181487 |
| average opponent: 1531record: 4-5 | new rating: 1487 | |||