Foster III, Charles
Current rating: 1579
Record: 21-17
| Grand Prix Portland 2018 (modern) | starting rating: 1570 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 526 | Meyers, James (1445) | Won 2-0 | +161586 |
| 2modern | 316 | Gardner-Durbin, Brook (1530) | Lost 0-2 | -191567 |
| 3modern | 490 | Edington, Dravyn (1501) | Won 2-0 | +171584 |
| 4modern | 545 | Hill, Tucker (1609) | Won 2-1 | +181602 |
| 5modern | 234 | Hamilton, Granger (1537) | Lost 0-2 | -191583 |
| 6modern | 371 | Buteau, Jacques (1521) | Won 2-0 | +171600 |
| 7modern | 322 | Rider, Dominic (1460) | Lost 0-2 | -211579 |
| top | average opponent: 1515record: 4-3 | new rating: 1579 | ||
| Grand Prix Seattle 2018 (standard) (RIX standard) | starting rating: 1549 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 224 | VanLaethem, Jared (1446) | Won 2-1 | +161565 |
| 2standard | 110 | Jones, Lassen (1416) | Lost 1-2 | -211544 |
| 3standard | 544 | Agee, Austin (1501) | Won 2-1 | +181562 |
| 4standard | 219 | Chavez, Gilci (1529) | Won 2-1 | +171579 |
| 5standard | 148 | Wells, John W (1771) | Lost 1-2 | -151564 |
| 6standard | 232 | Kapos, Paul (1694) | Won 2-1 | +211585 |
| 7standard | 265 | Sullivan, Cameron (1782) | Lost 0-2 | -151570 |
| top | average opponent: 1591record: 4-3 | new rating: 1570 | ||
| Grand Prix Portland 2017 (XLN standard) | starting rating: 1480 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 404 | Heckathorn, Darby (1500) | Won 2-1 | +181498 |
| 2standard | 200 | Huston, Benjamin (1454) | Won 2-1 | +181516 |
| 3standard | 101 | Peck, Arthur (1646) | Lost 1-2 | -161500 |
| 4standard | 291 | Baumgart, Bailey (1519) | Won 2-0 | +181518 |
| 5standard | 133 | Botelho, Chris (1802) | Lost 0-2 | -131505 |
| 6standard | 222 | Edwards, Mitchell (1861) | Won 2-0 | +251530 |
| 7standard | 238 | Orr, Gregory (1466) | Won 2-0 | +161546 |
| 8standard | 161 | Barnhart, Ryan (1654) | Won 2-0 | +201566 |
| 9standard | 86 | Whaley, Christopher (1516) | Lost 1-2 | -191547 |
| 10standard | 180 | Leboki, Taylor (1552) | Won 2-0 | +191566 |
| 11standard | 76 | Bell, Rebecca (1640) | Lost 0-2 | -171549 |
| top | average opponent: 1601record: 7-4 | new rating: 1549 | ||
| Grand Prix Las Vegas 2017 (limited) (AKH limited) | starting rating: 1516 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 670 | Crowder, Daniel (1510) | Lost 0-2 | -181498 |
| 2sealed | 705 | Gagnon Paradis, Ulysse (1525) | Lost 1-2 | -181480 |
| top | average opponent: 1518record: 0-2 | new rating: 1480 | ||
| Grand Prix Nashville 2010 (SOM limited) | starting rating: 1536 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 6 | Bone, Kenneth (1500) | Lost 1-2 | -191517 |
| 2sealed | 229 | Batts, Andrew M (1464) | Lost 0-2 | -191498 |
| 3sealed | 292 | Eaton, Christopher A (1465) | Won 2-0 | +181516 |
| top | average opponent: 1476record: 1-2 | new rating: 1516 | ||
| Grand Prix Boston 2009 (M10 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 479 | Caihill, Stephen (1500) | Won 2-0 | +181518 |
| 2sealed | 444 | Samson, Roger (1518) | Won 2-0 | +181536 |
| 3sealed | 409 | Mason, Christopher (1507) | Lost 1-2 | -191517 |
| 4sealed | 609 | Christiansen, Nico (1448) | Won 2-1 | +171534 |
| 5sealed | 471 | Abalos, Sam (1536) | Lost 1-2 | -181516 |
| 6sealed | 575 | Dubois, Adam (1519) | Won 2-0 | +181534 |
| 7sealed | 511 | Chafe, Nathaniel (1486) | Won 2-0 | +171551 |
| 8sealed | 500 | Lax, Ari (1689) | Lost 1-2 | -151536 |
| top | average opponent: 1525record: 5-3 | new rating: 1536 | ||