Chang, John
Current rating: 1415
Record: 8-14
| Grand Prix San Jose 2017 (AER limited) | starting rating: 1421 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 419 | Schumacher, Matthew (1483) | Lost 1-2 | -171404 |
| 2sealed | 545 | Saraceno, Ben (1481) | Won 2-0 | +201424 |
| 3sealed | 467 | Bran, Robert (1498) | Won 2-0 | +191443 |
| 4sealed | 222 | Pottinger, Troy (1560) | Won 2-1 | +201463 |
| 5sealed | 176 | Jardine, Brian (1537) | Lost 0-2 | -161447 |
| 6sealed | 336 | Pavelka, Alex (1626) | Lost 1-2 | -151432 |
| 7sealed | 450 | Lopez, Derrek (1499) | Lost 0-2 | -171415 |
| top | average opponent: 1526record: 3-4 | new rating: 1415 | ||
| Grand Prix Las Vegas 2015 (1) (MM2 limited) | starting rating: 1451 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 65 | Donald, Maxmen (1500) | Won 2-1 | +181469 |
| 2sealed | 190 | Schmalzer, Christopher (1560) | Lost 1-2 | -161453 |
| 3sealed | 252 | Weiner, Josh (1634) | Lost 0-2 | -151438 |
| 4sealed | 442 | Hileman, Derek (1481) | Lost 0-2 | -171421 |
| top | average opponent: 1544record: 1-3 | new rating: 1421 | ||
| Grand Prix Nashville 2010 (SOM limited) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 567 | Simpson, Nate (1500) | Lost 1-2 | -181446 |
| 2sealed | 604 | Blitch, Samuel (1482) | Lost 0-2 | -171429 |
| 3sealed | 709 | Utley, Bryan (1464) | Won 2-0 | +191448 |
| 4sealed | 662 | Simmons, Nick (1486) | Won 2-1 | +181466 |
| 5sealed | 580 | Berger, Austin (1590) | Lost 1-2 | -151451 |
| top | average opponent: 1504record: 2-3 | new rating: 1451 | ||
| Grand Prix Kaohsiung 2001 (PLS limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 12 | Yang, John (1500) | Won 2-0 | +181518 |
| 2sealed | 39 | Sun, Weng Cheng (1500) | Won 2-1 | +181536 |
| 3sealed | 30 | Chou, Tzue Shiang (1536) | Lost 0-2 | -181518 |
| 4sealed | 63 | Lin, Cheng Yung (1518) | Lost 0-2 | -181500 |
| 5sealed | 56 | Chou, John (1500) | Lost 0-2 | -181482 |
| 6sealed | 75 | Ip, Chi Wai (1481) | Lost 1-2 | -181464 |
| top | average opponent: 1506record: 2-4 | new rating: 1464 | ||