Cook, John
Current rating: 1585
Record: 15-15-3
| Grand Prix Los Angeles 2018 (M19 standard) | starting rating: 1397 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 213 | Gutierrez, Fernando (1489) | Lost 1-2 | -161381 |
| 2standard | 352 | Celaya, Rudy (1407) | Won 2-0 | +181399 |
| 3standard | 412 | Chin, Thomas (1487) | Won 2-1 | +201419 |
| 4standard | 160 | Wu, Yanfei (1523) | Won 2-0 | +201439 |
| 5standard | 179 | Yeem, Soohwang (1953) | Won 2-0 | +271466 |
| 6standard | 125 | David, Daniel Eleazar (1509) | Won 2-0 | +181484 |
| 7standard | 38 | Landweber, Joseph (1641) | Lost 0-2 | -151469 |
| 8standard | 68 | Laucke, Michael (1557) | Won 2-0 | +201489 |
| 9standard | 103 | Lossett, Joe (1934) | Lost 0-2 | -111478 |
| 10standard | 83 | Cohen, Brendan (1847) | Won 2-0 | +251503 |
| 11standard | 52 | Black, Samuel (1929) | Won 2-1 | +251528 |
| 12standard | 61 | Manansala, Bayani (1914) | Won 2-1 | +251553 |
| 13standard | 18 | Paxton, Corey (1770) | Won 2-1 | +221575 |
| 14standard | 23 | Saito, Shinya (2029) | Won 2-1 | +261601 |
| 15standard | 17 | Perez, Samuel (1723) | Lost 0-2 | -161585 |
| top | average opponent: 1714record: 11-4 | new rating: 1585 | ||
| Grand Prix Portland 2017 (XLN standard) | starting rating: 1424 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 329 | Dale, Luke (1500) | Draw 1-1 | +21426 |
| 2standard | 425 | Weaver, Jade (1500) | Lost 0-2 | -171409 |
| 3standard | 672 | Sem, Beth (1481) | Draw 1-1 | +11410 |
| 4standard | 733 | Greeneltch, Nathan (1484) | Won 2-0 | +201430 |
| 5standard | 597 | Pavelchak, Drew (1564) | Lost 1-2 | -161414 |
| 6standard | 645 | Salvagione, Rachel (1482) | Lost 0-2 | -171397 |
| top | average opponent: 1502record: 1-3-2 | new rating: 1397 | ||
| Grand Prix Dallas-Fort Worth 2016 (modern) | starting rating: 1472 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 391 | Beardsley, Jake (1479) | Lost 1-2 | -181454 |
| 2modern | 622 | Penick, John (1823) | Lost 0-2 | -121442 |
| 3modern | 837 | Draper, Jesse (1463) | Lost 0-2 | -171425 |
| 4modern | 939 | Nayar, Ryan (1444) | Won 2-1 | +181443 |
| 5modern | 849 | Benson, Austin (1394) | Lost 0-2 | -191424 |
| top | average opponent: 1521record: 1-4 | new rating: 1424 | ||
| Grand Prix Atlanta 2015 (BFZ limited) | starting rating: 1463 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 107 | Hebert, Ryan (1500) | Lost 0-2 | -171446 |
| 2sealed | 787 | McGill, Clint (1564) | Draw 1-1 | +21448 |
| 3sealed | 831 | Dinwiddie, Ryan (1481) | Won 2-1 | +191467 |
| 4sealed | 639 | Winski, Jack (1502) | Won 2-1 | +181485 |
| 5sealed | 442 | Zhao, Kevin (1735) | Lost 0-2 | -131472 |
| top | average opponent: 1556record: 2-2-1 | new rating: 1472 | ||
| Grand Prix Charlotte 2013 (GTC limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 881 | Keebler, Richard (1465) | Lost 1-2 | -191481 |
| 2sealed | 1020 | McNay, Christopher (1482) | Lost 0-2 | -181463 |
| top | average opponent: 1473record: 0-2 | new rating: 1463 | ||