Colston, John
Current rating: 1640
Record: 23-18
| Grand Prix Cleveland 2015 (FRF limited) | starting rating: 1627 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 15 | Smith Jr., Mark (1526) | Lost 0-2 | -201607 |
| 4sealed | 417 | Meade, Chauncey (1482) | Won 2-1 | +161623 |
| 5sealed | 167 | Benjamin, Romain (1536) | Won 2-1 | +161639 |
| 6sealed | 235 | Eshghy, Pat (1820) | Won 2-0 | +211660 |
| 7sealed | 138 | Tetley, Brett (1573) | Won 2-0 | +171677 |
| 8sealed | 67 | Johnson, Peter (1650) | Lost 0-2 | -191658 |
| 9sealed | 140 | Zhang, Peter (1640) | Lost 1-2 | -181640 |
| top | average opponent: 1604record: 4-3 | new rating: 1640 | ||
| Grand Prix Memphis 2015 (FRF standard) | starting rating: 1511 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 78 | Archey, Bruce (1527) | Won 2-1 | +181529 |
| 4standard | 83 | Oldaker, Matt (1774) | Won 2-0 | +231552 |
| 5standard | 28 | Hopson, Randall (1592) | Won 2-1 | +181570 |
| 6standard | 1 | Fournier, Daniel (1900) | Won 2-0 | +241594 |
| 7standard | 3 | Tu, Daniel (1585) | Won 2-1 | +181612 |
| 8standard | 2 | Forstner, John (1598) | Lost 0-2 | -181594 |
| 9standard | 7 | Johnson, Cody S (1651) | Won 2-1 | +191613 |
| 10standard | 9 | Mize, Logan (1780) | Lost 1-2 | -151598 |
| 11standard | 10 | Rubin, Steve (2075) | Lost 0-2 | -101588 |
| 12standard | 26 | Suydam, Daniel (1643) | Won 2-1 | +191607 |
| 13standard | 17 | Calle, Christopher (1605) | Won 2-1 | +181625 |
| 14standard | 23 | Kaiser, Taylor (1655) | Won 2-0 | +191644 |
| 15standard | 10 | Dykman, Stephen (1718) | Lost 1-2 | -171627 |
| top | average opponent: 1700record: 9-4 | new rating: 1627 | ||
| Grand Prix Cincinnati 2014 (BNG standard) | starting rating: 1527 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 97 | Van Hoose, Bradley (1518) | Won 2-0 | +171544 |
| 3standard | 299 | Miller, Bud (1536) | Won 2-1 | +181562 |
| 4standard | 5 | Vorwald, Matthew (1538) | Lost 0-2 | -181544 |
| 5standard | 108 | Davidson, Keenan (1675) | Lost 1-2 | -161528 |
| 6standard | 317 | McGovern, Clint (1576) | Lost 0-2 | -171511 |
| top | average opponent: 1569record: 2-3 | new rating: 1511 | ||
| Grand Prix Richmond 2014 (modern) | starting rating: 1472 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 152 | Sharpe, Stacey (1518) | Won 2-0 | +191491 |
| 3modern | 118 | Hyde, Simon (1538) | Won 2-0 | +191510 |
| 4modern | 39 | Dutton, Troy (1553) | Won 2-0 | +181528 |
| 5modern | 53 | Bock, Lance (1505) | Won 2-0 | +181546 |
| 6modern | 17 | O'Quinn, Tim (1600) | Won 2-1 | +191565 |
| 7modern | 12 | Flores, Edgar (1786) | Lost 1-2 | -141551 |
| 8modern | 41 | Reed, David (1547) | Won 2-0 | +181569 |
| 9modern | 25 | John, Alexander (1922) | Lost 0-2 | -121557 |
| 10modern | 143 | Huffstuttler, Kryztofer (1596) | Lost 1-2 | -171540 |
| 11modern | 184 | King, Kevin (1504) | Won 2-1 | +171557 |
| 12modern | 149 | Ferrando, Matthew (1823) | Lost 1-2 | -131544 |
| 13modern | 143 | Waugh, James (1585) | Lost 0-2 | -171527 |
| top | average opponent: 1623record: 7-5 | new rating: 1527 | ||
| Grand Prix Louisville 2013 (THS standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 244 | Faeder, Dustin (1813) | Won 2-0 | +241524 |
| 4standard | 153 | Uppal, Justin (1675) | Lost 1-2 | -161508 |
| 5standard | 287 | Cobb, Richard (1396) | Lost 0-2 | -201488 |
| 6standard | 279 | Rolen, Ryan R (1578) | Lost 0-2 | -161472 |
| top | average opponent: 1616record: 1-3 | new rating: 1472 | ||