Kohnstamm, David
Current rating: 1455
| Grand Prix Amsterdam 2017 (AKH standard) | starting rating: 1420 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 186 | Gladwin, Marianne (1354) | Won 2-0 | +161436 |
| 2standard | 35 | Cipriano, Luca (1485) | Won 2-0 | +191455 |
| 3standard | 191 | Harvey, Dominic (1718) | Lost 0-2 | -131442 |
| 4standard | 279 | Van Heck, Ruben (1650) | Won 2-0 | +221464 |
| 5standard | 207 | Kenyeres, Akos (1748) | Lost 0-2 | -131451 |
| 6standard | 354 | Nickelsen, Kjartan (1550) | Lost 1-2 | -161435 |
| 7standard | 293 | Larsson, Michael (1356) | Won 2-1 | +161451 |
| 8standard | 291 | Dahl, Tina (1592) | Won 2-0 | +211472 |
| 9standard | 243 | Immerzeel, Nick (1527) | Lost 1-2 | -171455 |
| top | average opponent: 1553record: 5-4 | new rating: 1455 | ||
| Grand Prix Utrecht 2017 (AER standard) | starting rating: 1430 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 147 | Van Rooij, Jan (1500) | Lost 1-2 | -171413 |
| 2standard | 384 | Van Den Berg, Tim (1443) | Won 2-1 | +191432 |
| 3standard | 513 | Salsa, Rafael (1502) | Lost 0-2 | -171415 |
| 4standard | 488 | Offenberg, Barend (1657) | Lost 0-2 | -131402 |
| 5standard | 563 | Pearce, Darius (1248) | Won 2-0 | +151417 |
| 6standard | 484 | Baum, Tobias (1487) | Won 2-1 | +191436 |
| 7standard | 357 | Berentsen, Robbert (1522) | Lost 0-2 | -161420 |
| top | average opponent: 1480record: 3-4 | new rating: 1420 | ||
| Grand Prix Eindhoven 2005 (extended) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 327 | Steijvers, Rim (1500) | Lost 0-2 | -181482 |
| 2extended | 405 | Brienen, Robin (1481) | Won 2-0 | +181500 |
| 3extended | 353 | Holtin, Benjamin (1636) | Lost 0-2 | -161484 |
| 4extended | 436 | Darnhofer, Robert (1430) | Lost 1-2 | -191465 |
| 5extended | 383 | Rijcks, Bas (1464) | Lost 1-2 | -181447 |
| 6extended | 370 | Diender, Jeroen (1447) | Won 2-0 | +181465 |
| 7extended | 282 | Nachtigall, Chris (1471) | Lost 1-2 | -171448 |
| 8extended | 245 | Mattes, Sebastian (1482) | Lost 1-2 | -181430 |
| top | average opponent: 1489record: 2-6 | new rating: 1430 | ||