Duddy, Brian
Current rating: 1573
| Grand Prix San Jose 2017 (AER limited) | starting rating: 1513 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 198 | Young, Travis (1486) | Lost 1-2 | -191494 |
| 2sealed | 549 | Murcia, Walter (1453) | Won 2-0 | +181512 |
| 3sealed | 708 | Snyder, Trent (1499) | Won 2-1 | +171529 |
| 4sealed | 497 | Lee, Michael (1543) | Won 2-0 | +191548 |
| 5sealed | 329 | Cerone, Anthony (1533) | Won 2-0 | +171565 |
| 6sealed | 90 | Koessel, Noah (1717) | Lost 0-2 | -151550 |
| 7sealed | 198 | Marquez, Max (1539) | Won 2-0 | +181568 |
| 8sealed | 228 | Velazquez, Erick (1694) | Won 2-0 | +201588 |
| 9sealed | 99 | Wohlsdorf, Matt (1731) | Won 2-0 | +211609 |
| 10draft | 24 | Cook, Megan (1576) | Lost 0-2 | -191590 |
| 11draft | 136 | Fiffles, Adam (1658) | Lost 0-0 | -171573 |
| top | average opponent: 1584record: 7-4 | new rating: 1573 | ||
| Grand Prix Sacramento 2014 (THS limited) | starting rating: 1491 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 15 | Scheel, Brandon (1656) | Lost 0-2 | -151476 |
| 2sealed | 455 | Maurer, Matthew (1481) | Lost 1-2 | -181458 |
| 3sealed | 462 | Greenberg-Woo, Susan (1464) | Won 2-0 | +181476 |
| 4sealed | 417 | Merriam, David (1483) | Won 2-1 | +191495 |
| 5sealed | 306 | Geske, Andrew (1501) | Won 2-0 | +181513 |
| 6sealed | 264 | Tien, Steven (1518) | Won 2-1 | +181531 |
| 7sealed | 95 | Garvin, Andrew (1539) | Lost 1-2 | -181513 |
| top | average opponent: 1520record: 4-3 | new rating: 1513 | ||
| Grand Prix Oakland 2013 (M14 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 416 | Nida, John (1539) | Won 2-0 | +191519 |
| 2sealed | 538 | Smith, Kerestell (1518) | Lost 0-2 | -181501 |
| 3sealed | 607 | Kerstein, Seth (1500) | Won 2-0 | +181519 |
| 4sealed | 258 | Houghton, Nicholas (1521) | Won 2-1 | +181537 |
| 5sealed | 203 | Chambers, David R (1682) | Lost 1-2 | -161521 |
| 6sealed | 281 | Lalague, Marc (1867) | Lost 0-2 | -121509 |
| 7sealed | 361 | Jacobson, Matthew (1502) | Lost 0-2 | -181491 |
| top | average opponent: 1590record: 3-4 | new rating: 1491 | ||