O'Brien, Peter J
Current rating: 1613
| Grand Prix Providence 2011 (legacy) | starting rating: 1580 | |||
| round | table | opponent (rating) | result | Δrating |
| 2legacy | 447 | King, Byron (1506) | Won 2-0 | +161596 |
| 3legacy | 458 | Newbold, Jesse (1618) | Lost 1-2 | -171579 |
| 4legacy | 556 | Beausoleil, Trevor (1525) | Won 2-0 | +171596 |
| 5legacy | 472 | King, Shawn (1490) | Won 2-0 | +161612 |
| 6legacy | 432 | Clemmer, Garrett (1524) | Lost 0-2 | -201592 |
| 7legacy | 465 | Hoey, Matthew (1546) | Won 2-0 | +171609 |
| 8legacy | 481 | Ellis, Jason (1525) | Won 2-0 | +171626 |
| 9legacy | 425 | Zirolli, Matthew (1581) | Won 2-0 | +171643 |
| 10legacy | 67 | Markowicz, Eric (1565) | Won 2-0 | +171660 |
| 11legacy | 19 | Gaudreault, Eric (1617) | Lost 1-2 | -191641 |
| 12legacy | 63 | Gleicher, David (1751) | Lost 0-2 | -161625 |
| 13legacy | 70 | Cook, Bryant (1755) | Won 2-0 | +201645 |
| 14legacy | 48 | Viola, Joe (1638) | Lost 0-2 | -181627 |
| 15legacy | 55 | Shay, Rich (1826) | Lost 0-2 | -141613 |
| top | average opponent: 1605record: 8-6 | new rating: 1613 | ||
| Grand Prix Columbus 2010 (legacy) | starting rating: 1566 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 559 | Rowe, Jeremy (1364) | Won 2-1 | +141580 |
| 2legacy | 540 | Ryder, Sean (1650) | Won 2-0 | +191599 |
| 3legacy | 425 | Calderon, Christopher (1482) | Won 2-1 | +161615 |
| 4legacy | 408 | Haesler, Kevin J (1554) | Won 2-1 | +171632 |
| 5legacy | 434 | Saito, Tomoharu (2028) | Lost 1-2 | -111621 |
| 6legacy | 433 | Topping, Benjamin (1556) | Lost 1-2 | -191602 |
| 7legacy | 516 | Rickard, Jacob R (1488) | Lost 1-2 | -201582 |
| 8legacy | 499 | Matthews, Gregory (1516) | Won 2-0 | +161598 |
| 9legacy | 474 | Ong, Wei Jian (1549) | Lost 1-2 | -181580 |
| top | average opponent: 1576record: 5-4 | new rating: 1580 | ||
| Grand Prix Washington DC 2010 (ROE standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 127 | Dorsett, Neal (1500) | Won 2-1 | +181518 |
| 2standard | 27 | Hill, Andrew (1518) | Won 2-0 | +181536 |
| 3standard | 23 | Goldstein, Max (1522) | Won 2-0 | +181554 |
| 4standard | 7 | Turtenwald, Owen (1909) | Lost 1-2 | -121542 |
| 5standard | 141 | Swank, Alex (1537) | Won 2-1 | +181560 |
| 6standard | 105 | Ruess, Jan (1796) | Won 2-1 | +221582 |
| 7standard | 49 | Hall, Zack (1835) | Won 2-0 | +231605 |
| 8standard | 36 | Guardiano, Patrick (1625) | Lost 1-2 | -181587 |
| 9standard | 84 | Gill, Andrew J (1571) | Won 2-1 | +181605 |
| 10standard | 26 | Bushard, Ryan (1601) | Won 2-0 | +181623 |
| 11standard | 58 | Jacob, Michael (1888) | Lost 1-2 | -141609 |
| 12standard | 67 | Levy, Raphael (1880) | Lost 1-2 | -131596 |
| 13standard | 89 | Stead, Bob (1689) | Lost 0-2 | -161580 |
| 14standard | 82 | Kadooka, Toshiyuki (1792) | Lost 0-2 | -141566 |
| top | average opponent: 1690record: 8-6 | new rating: 1566 | ||