Polkinghorn, Brian
Current rating: 1469
Record: 3-5
| Grand Prix Orlando 2018 (M19 standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 235 | Tremblay, Ken (1500) | Won 2-1 | +181518 |
| 2standard | 53 | Peretz, Michael (1725) | Lost 0-2 | -141504 |
| 3standard | 408 | Simmons, Julie (1500) | Lost 1-2 | -181486 |
| 4standard | 373 | Paez, Yared (1477) | Lost 0-2 | -191467 |
| 5standard | 415 | Rossheim, Barry (1471) | Won 2-0 | +191486 |
| 6standard | 334 | Zachow, Andrew (1656) | Lost 1-2 | -151471 |
| 7standard | 297 | Lukose, Steiner (1465) | Won 2-0 | +181489 |
| 8standard | 230 | Larsen, Albert (1421) | Lost 0-2 | -201469 |
| average opponent: 1527record: 3-5 | new rating: 1469 | |||