Kolschowsky, David
Current rating: 1554
| Grand Prix Indianapolis 2013 (RTR limited) | starting rating: 1501 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 79 | Cox, Doug H (1565) | Won 2-0 | +191520 |
| 3sealed | 130 | Eason, Anthony (1661) | Lost 0-2 | -151505 |
| 4sealed | 184 | Barrentine, Scott (1728) | Won 2-1 | +221527 |
| 5sealed | 93 | Spear, Azrael (1671) | Won 2-0 | +201547 |
| 6sealed | 39 | Mayer, Scott (1625) | Won 2-1 | +201567 |
| 7sealed | 147 | Alcorn, Bryan (1747) | Won 2-1 | +211588 |
| 8sealed | 23 | DeSando, Mike V (1604) | Lost 1-2 | -181570 |
| 9sealed | 126 | Koepke, Devin (1695) | Lost 0-2 | -161554 |
| top | average opponent: 1662record: 5-3 | new rating: 1554 | ||
| Grand Prix Chicago 2012 (modern) | starting rating: 1525 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 82 | Alden, Matt (1414) | Draw 1-1 | -21523 |
| 2modern | 264 | Pai, David (1500) | Won 2-0 | +171540 |
| 3modern | 213 | Catanzaro, Brian (1523) | Lost 1-2 | -181522 |
| 4modern | 371 | Jones, Jason (1478) | Won 2-1 | +171539 |
| 5modern | 268 | Papa, Nino Christopher (1517) | Lost 0-2 | -181521 |
| 6modern | 352 | hsu, lite (1511) | Lost 1-2 | -181503 |
| 7modern | 347 | Estes, Jacob (1460) | Won 5-1 | +171520 |
| 8modern | 262 | Baker, Joe M (1466) | Lost 0-2 | -191501 |
| top | average opponent: 1484record: 3-4-1 | new rating: 1501 | ||
| Grand Prix Columbus 2012 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 21 | Perry, Tom (1500) | Won 2-0 | +181518 |
| 2modern | 221 | Ulman, Ian (1518) | Lost 0-2 | -181500 |
| 3modern | 333 | Wilkerson, Tyler (1404) | Won 2-0 | +161516 |
| 4modern | 277 | Bayliff, John (1518) | Lost 1-2 | -181498 |
| 5modern | 366 | Elenbogen, Andrew (1633) | Won 2-0 | +211519 |
| 6modern | 297 | Soi, Vivek (1595) | Won 2-1 | +191538 |
| 7modern | 197 | Leverone, Ryan (1648) | Won 2-0 | +201558 |
| 8modern | 67 | Blegen, Eric (1575) | Lost 1-2 | -181540 |
| 9modern | 169 | Bankman-Fried, Sam (1663) | Lost 1-2 | -151525 |
| top | average opponent: 1561record: 5-4 | new rating: 1525 | ||