O'Connor, Mark
Current rating: 1410
Record: 1-6
| Grand Prix Columbus 2004 (DST limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 194 | Kirkey, Peter (1500) | Lost 0-1 | -181482 |
| 2sealed | 255 | Karrigan, Brian (1465) | Lost 0-2 | -181464 |
| 3sealed | 338 | Caldwell, Joshua (1464) | Lost 0-2 | -181446 |
| 4sealed | 364 | Pazquino, Mike (1445) | Lost 0-2 | -181428 |
| 6sealed | 256 | Frost, Brian (1446) | Lost 0-2 | -181410 |
| 7sealed | 212 | Weisenberger, Richard (1428) | Won 1-0 | +181428 |
| 8sealed | 169 | Cirunay, Cedric (1415) | Lost 0-2 | -181410 |
| average opponent: 1452record: 1-6 | new rating: 1410 | |||