O'Brien, Jason
Current rating: 1478
| Grand Prix Vienna 2004 (COK limited) | starting rating: 1555 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 39 | Kovacs, Szilveszter (1500) | Lost 0-2 | -191536 |
| 2sealed | 323 | Reuschenbach, Janosch (1483) | Lost 0-2 | -191517 |
| 3sealed | 436 | Landl, Michael (1403) | Lost 0-2 | -201497 |
| 4sealed | 451 | Binder, Alex (1447) | Lost 1-2 | -191478 |
| top | average opponent: 1458record: 0-4 | new rating: 1478 | ||
| Grand Prix Memphis 1999 (Urza's block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 71 | Kipapa, Barney (1500) | Won 0-0 | +181518 |
| 2block | 81 | Ranks, Matthew (1508) | Lost 0-0 | -181500 |
| 3block | 127 | Pile, Douglas (1500) | Lost 0-0 | -181482 |
| 4block | 112 | Ansley, Justin (1483) | Won 0-0 | +181500 |
| 5block | 112 | Rhodes, Brooks (1484) | Won 0-0 | +181518 |
| 6block | 72 | Kesselman, Eric (1590) | Won 0-0 | +191537 |
| 7block | 65 | Sanderson, Gabriel (1520) | Won 0-0 | +181555 |
| top | average opponent: 1512record: 5-2 | new rating: 1555 | ||
| Grand Prix Kansas City 1999 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 4extended | 86 | Leitsch, Jess (1500) | Won 0-0 | +181518 |
| 5extended | 84 | Haury, Sonny (1519) | Lost 0-0 | -181500 |
| top | average opponent: 1510record: 1-1 | new rating: 1500 | ||