Halford, Clay A
Current rating: 1491
Record: 15-18
| Grand Prix Sydney 2013 (RTR limited) | starting rating: 1445 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 118 | Borja, Chedrik (1500) | Won 2-0 | +191464 |
| 2sealed | 122 | Reeve, Hamish T (1605) | Won 2-0 | +211485 |
| 3sealed | 34 | Jackway, Robert (1705) | Lost 0-2 | -141471 |
| 4sealed | 187 | Jackson, Harry (1449) | Won 2-0 | +171488 |
| 5sealed | 111 | Neagle, Justin (1538) | Lost 0-2 | -171471 |
| 6sealed | 148 | Cappy, Luc (1516) | Won 2-1 | +191490 |
| 7sealed | 79 | Victory, Luke (1538) | Won 2-1 | +191509 |
| 8sealed | 39 | Lee, Heyang (1509) | Lost 0-2 | -181491 |
| top | average opponent: 1545record: 5-3 | new rating: 1491 | ||
| Grand Prix Auckland 2012 (RTR standard) | starting rating: 1412 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 29 | Gordon, Hamish (1639) | Lost 0-2 | -141398 |
| 2standard | 98 | Antoine, Dennis (1411) | Won 2-0 | +181416 |
| 3standard | 46 | Stuart, James (1497) | Won 2-1 | +191435 |
| 4standard | 79 | Johnson, Paul M (1483) | Lost 0-2 | -171418 |
| 5standard | 92 | Lee, Charles JY (1506) | Won 2-1 | +201438 |
| 6standard | 78 | Jackway, Robert (1697) | Lost 1-2 | -131425 |
| 7standard | 74 | Vanderhaven, Michael (1563) | Won 2-1 | +201445 |
| top | average opponent: 1542record: 4-3 | new rating: 1445 | ||
| Grand Prix Brisbane 2011 (ISD standard) | starting rating: 1463 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 123 | Sati, Pratik (1500) | Lost 1-2 | -171446 |
| 2standard | 115 | Spagnolo, Jesse (1482) | Lost 1-2 | -171429 |
| 3standard | 157 | Fowler, Shane (1468) | Lost 1-2 | -181411 |
| 4standard | 181 | Gaskell, Rodney (1446) | Won 0-0 | +191430 |
| 5standard | 165 | Telfer, Paul (1414) | Lost 1-2 | -181412 |
| 6standard | 145 | Frankham, Scott (1446) | Won 2-0 | +181430 |
| 7standard | 125 | Coffin, Jeremie (1395) | Lost 0-2 | -181412 |
| top | average opponent: 1450record: 2-5 | new rating: 1412 | ||
| Grand Prix Sydney 2010 (SOM limited) | starting rating: 1456 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 119 | Gloss, Antony (1532) | Won 2-0 | +191475 |
| 2sealed | 51 | Egan, Owen (1521) | Won 2-0 | +191494 |
| 3sealed | 10 | Matsuyama, Satoshi (1638) | Lost 1-2 | -161478 |
| 4sealed | 122 | David, Julius Amschel (1522) | Won 2-1 | +191497 |
| 5sealed | 57 | Luo, Ryan (1595) | Lost 1-2 | -161481 |
| 6sealed | 111 | Madigan, Damien (1500) | Lost 0-2 | -181463 |
| top | average opponent: 1551record: 3-3 | new rating: 1463 | ||
| Grand Prix Melbourne 2009 (ZEN limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 4sealed | 53 | Evans, Merlyn (1451) | Lost 0-2 | -191481 |
| 5sealed | 31 | Tanahashi, Masayasu (1864) | Lost 1-2 | -111470 |
| 6sealed | 74 | Han, Liwei (1568) | Won 2-1 | +201490 |
| 7sealed | 42 | Tan, Aaron (1442) | Lost 0-2 | -191471 |
| 8sealed | 68 | Schafer, Ross (1630) | Lost 1-2 | -151456 |
| top | average opponent: 1591record: 1-4 | new rating: 1456 | ||