Zimmerman, Bob
Current rating: 1461
Record: 3-5
| Grand Prix Portland 2018 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 446 | Cox, Jay (1364) | Won 2-1 | +161516 |
| 2modern | 60 | Means, Charles (1519) | Lost 0-2 | -181498 |
| 3modern | 670 | Rosenberg, Zeke (1451) | Lost 1-2 | -191479 |
| 4modern | 609 | Crawford, Alicia (1448) | Won 2-0 | +171496 |
| 5modern | 643 | Cornett, Jude (1502) | Lost 0-2 | -181478 |
| 6modern | 561 | Walthall, Travis (1478) | Lost 1-2 | -181460 |
| 7modern | 509 | Johnston, Julian (1482) | Won 2-1 | +191479 |
| 8modern | 381 | San Luis, Francis (1475) | Lost 0-2 | -181461 |
| average opponent: 1465record: 3-5 | new rating: 1461 | |||