Guckian, David
Current rating: 1472
| Grand Prix Seattle-Tacoma 2012 (DKA limited) | starting rating: 1489 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 32 | Davy, Brendan (1500) | Won 2-1 | +181507 |
| 2sealed | 275 | Lee, Derrick (1518) | Lost 0-2 | -181489 |
| 3sealed | 363 | Clark, Steven (1500) | Won 2-1 | +191508 |
| 4sealed | 329 | Thrasher, Nate (1518) | Lost 0-2 | -181490 |
| 5sealed | 292 | Eide, Darrin (1518) | Lost 0-2 | -181472 |
| top | average opponent: 1511record: 2-3 | new rating: 1472 | ||
| Grand Prix Seattle 2005 (extended) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 43 | Jacobson, Josh (1500) | Won 2-1 | +191483 |
| 2extended | 85 | Doshi, Vishvas (1674) | Lost 0-2 | -151468 |
| 3extended | 73 | Lindquist, Ian (1501) | Won 2-0 | +191487 |
| 4extended | 91 | Brown, Tim (1545) | Lost 1-2 | -171470 |
| 5extended | 128 | Petke, Mike (1536) | Won 2-1 | +191489 |
| top | average opponent: 1551record: 3-2 | new rating: 1489 | ||
| Grand Prix Oakland 2004 (DST limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 138 | Cano, Robert (1503) | Lost 0-2 | -181482 |
| 2sealed | 152 | Burroughs, Caylen (1482) | Lost 0-2 | -181464 |
| top | average opponent: 1493record: 0-2 | new rating: 1464 | ||