O'Brien-Cockson, Brendan
Current rating: 1469
Record: 5-7
| Grand Prix Kansas City 2013 (modern) | starting rating: 1501 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 13 | Duggan, Jeremiah (1481) | Won 2-0 | +181519 |
| 2modern | 140 | Strunk, Chase (1570) | Lost 0-2 | -171502 |
| 3modern | 285 | Pirvu, Armand (1501) | Lost 1-2 | -181484 |
| 4modern | 335 | DePew, Benjamin (1646) | Lost 0-2 | -151469 |
| average opponent: 1549record: 1-3 | new rating: 1469 | |||
| Grand Prix Denver 2013 (legacy) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 186 | Yu, Bob (1545) | Lost 1-2 | -171483 |
| 2legacy | 213 | Winston, Alexander (1560) | Won 2-0 | +191502 |
| 3legacy | 140 | Dearing, Geoff (1444) | Lost 1-2 | -191483 |
| 4legacy | 273 | Smith, Wyndham W (1484) | Won 2-0 | +181501 |
| 5legacy | 251 | Mckinzie, Jay (1491) | Won 2-1 | +181519 |
| 6legacy | 193 | Li, Si-Ning (1558) | Lost 0-2 | -171502 |
| 7legacy | 191 | Gaard, Sam (1524) | Won 2-0 | +181520 |
| 8legacy | 132 | McIntosh, Lochlan (1474) | Lost 0-2 | -191501 |
| average opponent: 1510record: 4-4 | new rating: 1501 | |||