Cummings, John
Current rating: 1648
| Grand Prix Atlanta 2018 (modern) | starting rating: 1467 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 2 | Tripp, James (1486) | Won 2-0 | +191486 |
| 2modern | 191 | Smith, Jason (1820) | Won 2-1 | +231509 |
| 3modern | 296 | Pressley, Joseph (1867) | Lost 0-2 | -111498 |
| 4modern | 349 | Reed, James (1501) | Won 2-1 | +181516 |
| 5modern | 226 | Chatham, Jeremiah (1455) | Won 2-1 | +171533 |
| 6modern | 177 | Kipple, Sean (1573) | Won 2-0 | +181551 |
| 7modern | 128 | Peters, Kyle (1920) | Won 2-0 | +251576 |
| 8modern | 42 | Liu, Yuchen (1929) | Lost 1-2 | -121564 |
| 9modern | 68 | Putira, Sean (1427) | Lost 0-2 | -211543 |
| 10modern | 131 | Hatchel, Tyler (1801) | Won 2-0 | +231566 |
| 11modern | 71 | Yim, Chi Hoi (1776) | Won 2-1 | +221588 |
| 12modern | 86 | O'Shea, Andrew (1631) | Won 2-0 | +191607 |
| 13modern | 45 | Lorren, Phillip (1820) | Won 2-0 | +211628 |
| 14modern | 33 | Elias, Felix (1687) | Won 2-1 | +201648 |
| 15modern | 29 | Khare, Anand (1816) | ID | 01648 |
| top | average opponent: 1701record: 11-3-1 | new rating: 1648 | ||
| Grand Prix Charlotte 2016 (modern) | starting rating: 1516 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 265 | Pena, Edwin (1522) | Lost 1-2 | -181498 |
| 3modern | 860 | Brinkman, Stuart (1534) | Lost 0-2 | -181480 |
| 4modern | 678 | Little, Stephen (1562) | Won 2-1 | +201500 |
| 5modern | 685 | Gruber, Patrick (1599) | Lost 1-2 | -161484 |
| 6modern | 616 | van Sickle, Joseph (1566) | Lost 0-2 | -171467 |
| top | average opponent: 1557record: 1-4 | new rating: 1467 | ||
| Grand Prix Charlotte 2015 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 1032 | Hall, Joshua (1485) | Won 2-0 | +181518 |
| 2modern | 697 | Ali, Rebecca (1366) | Lost 1-2 | -211497 |
| 3modern | 930 | Evans, Michael F (1499) | Draw 1-1 | 01497 |
| 4modern | 986 | Allseitz, Brandin (1488) | Won 2-0 | +181515 |
| 5modern | 820 | Brown, Adam N (1520) | Won 2-1 | +181533 |
| 6modern | 754 | Shafer, Jason (1522) | Won 2-0 | +181551 |
| 7modern | 588 | Rodgers, Logan (1591) | Lost 0-2 | -171534 |
| 8modern | 645 | Capra, Adam (1540) | Lost 1-2 | -181516 |
| top | average opponent: 1502record: 4-3-1 | new rating: 1516 | ||