Costello, Stephen
Current rating: 1528
Record: 13-14-2
| Grand Prix Richmond 2018 (std) (M19 standard) | starting rating: 1513 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 23 | Low, Seth (1578) | Won 2-1 | +191532 |
| 2standard | 79 | VanBuskirk, Jason (1386) | Won 2-1 | +151547 |
| 3standard | 1 | Ertel, Daniel (1558) | Lost 1-2 | -181529 |
| 4standard | 135 | Wasson, John (1826) | Lost 1-2 | -121517 |
| 5standard | 232 | May, Keaton (1501) | Won 2-0 | +171534 |
| 6standard | 192 | Deltour, Louis (1993) | Lost 1-2 | -101524 |
| 7standard | 211 | Miller, Zackary (1525) | Won 2-0 | +181542 |
| 8standard | 182 | Barkon, Daniel (1757) | Lost 1-2 | -141528 |
| top | average opponent: 1640record: 4-4 | new rating: 1528 | ||
| Grand Prix Atlanta 2017 (XLN standard) | starting rating: 1468 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 338 | Wolfe, Jeremy (1458) | Won 2-0 | +181486 |
| 2standard | 91 | Nguyen, Minh (1623) | Won 2-0 | +201506 |
| 3standard | 271 | Lawrence, Paul (1465) | Won 2-0 | +171523 |
| 4standard | 17 | Miller, Blake (1487) | Won 2-0 | +181541 |
| 5standard | 5 | Hampton, Andrew (1858) | Won 2-1 | +231564 |
| 6standard | 22 | Nagy, Stephen (1896) | Lost 0-2 | -121552 |
| 7standard | 112 | Maier, Christopher (1967) | Won 2-0 | +251577 |
| 8standard | 25 | Davis, Matthew (1534) | Lost 0-2 | -191558 |
| 9standard | 118 | Mizell, Ryan (1617) | Won 2-0 | +201578 |
| 10standard | 36 | Guan, Thomas Zhennan (1803) | Lost 0-2 | -141564 |
| 11standard | 132 | Wrixon, Raymond (1534) | Draw 1-1 | -11563 |
| 12standard | 102 | Matteson, Joshua (1576) | Lost 1-2 | -181545 |
| 13standard | 126 | Monterrey, Paul (1627) | Lost 1-2 | -161529 |
| 14standard | 133 | Clift, Brent (1545) | Draw 1-1 | 01529 |
| 15standard | 125 | Deylius, Matt (1608) | Lost 0-2 | -161513 |
| top | average opponent: 1640record: 7-6-2 | new rating: 1513 | ||
| Grand Prix Boston-Worcester 2014 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 1082 | Polyakov, Alexander (1597) | Lost 0-2 | -161484 |
| 2modern | 1135 | Felizzola, Nick (1481) | Won 2-0 | +181502 |
| 3modern | 1006 | Croan, Thomas C (1518) | Lost 1-2 | -181484 |
| 4modern | 1098 | Gemme, Mike (1539) | Lost 0-2 | -171467 |
| 5modern | 1142 | Keenan, Joseph (1465) | Won 2-0 | +181485 |
| 6modern | 1083 | Fink, Erik (1530) | Lost 0-2 | -171468 |
| top | average opponent: 1522record: 2-4 | new rating: 1468 | ||