Chojnacki, Robert
Current rating: 1539
Record: 15-13-1
| Grand Prix Philadelphia 2008 (extended) | starting rating: 1525 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 164 | Loomis, Allen (1411) | Won 2-0 | +161541 |
| 2extended | 47 | Ramos, Jose (1495) | Won 2-0 | +171558 |
| 3extended | 134 | Szolopiak, James (1629) | Lost 0-2 | -161542 |
| 4extended | 293 | Tankus, Nathan (1524) | Won 2-1 | +171559 |
| 5extended | 86 | Walsh, Sean L (1448) | Lost 1-2 | -201539 |
| top | average opponent: 1501record: 3-2 | new rating: 1539 | ||
| Grand Prix Boston 2005 (extended) | starting rating: 1498 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 98 | Hobb, Tyler (1500) | Won 2-0 | +181516 |
| 2extended | 52 | Grygorczyk, Marius (1518) | Won 2-0 | +181534 |
| 3extended | 52 | Lewis, Jonathan D (1502) | Won 2-1 | +171551 |
| 4extended | 77 | Oiso, Masashi (1999) | Lost 0-2 | -101541 |
| 5extended | 69 | Landen, Stephen (1699) | Won 2-0 | +211562 |
| 6extended | 32 | Cecchetti, Daniel (1553) | Lost 1-2 | -191543 |
| 7extended | 127 | Reitemeyer, Michael (1533) | Lost 0-2 | -181525 |
| top | average opponent: 1615record: 4-3 | new rating: 1525 | ||
| Grand Prix Columbus 2004 (DST limited) | starting rating: 1498 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 142 | Wolfe, James (1500) | Won 2-0 | +181516 |
| 2sealed | 121 | Doehring, Brian (1518) | Won 2-0 | +181534 |
| 3sealed | 86 | Hartline, Joseph (1535) | Lost 1-2 | -181516 |
| 4sealed | 123 | Churchill, Lee (1488) | Lost 0-2 | -181498 |
| top | average opponent: 1510record: 2-2 | new rating: 1498 | ||
| Grand Prix Detroit 2003 (Onslaught block) | starting rating: 1499 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 195 | Hanning, Jordan (1500) | Won 2-1 | +181517 |
| 2block | 109 | Cook, Justin (1517) | Won 2-1 | +181535 |
| 3block | 60 | Stair, Seth (1500) | Lost 0-2 | -191516 |
| 4block | 131 | Winters, John (1517) | Lost 1-2 | -181498 |
| 5block | 186 | Bauer, Jason (1499) | Won 2-0 | +181516 |
| 6block | 108 | Herzberg, Scott (1517) | Lost 0-2 | -181498 |
| top | average opponent: 1508record: 3-3 | new rating: 1498 | ||
| Grand Prix Boston 2003 (LGN limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 153 | Lovelett, Shawn (1533) | Lost 1-2 | -171483 |
| 2sealed | 154 | Rizzo, John (1429) | Won 2-1 | +171500 |
| 3sealed | 126 | LaRue, Michael (1438) | Draw 1-1 | -11499 |
| 4sealed | 193 | Feinstein, David (1498) | Lost 0-2 | -181481 |
| 5sealed | 199 | Lees, Jonathan (1481) | Won 2-1 | +181499 |
| 6sealed | 151 | Hsiao, Elie (1498) | Lost 1-2 | -181481 |
| 7sealed | 133 | Smith, Zack (1482) | Won 2-1 | +181499 |
| top | average opponent: 1480record: 3-3-1 | new rating: 1499 | ||