Olthof, Jan
Current rating: 1441
Record: 9-14-3
| Grand Prix Brussels 2018 (M19 standard) | starting rating: 1423 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 94 | David, Jonathan (1472) | Won 2-0 | +191442 |
| 2standard | 130 | Gillissen, Pierre (1517) | Won 2-0 | +191461 |
| 3standard | 28 | De Paepe, Emiel (1576) | Lost 1-2 | -161445 |
| 4standard | 255 | Rempel, Peter (1519) | Won 2-0 | +201465 |
| 5standard | 186 | Biesmans, Wouter (1815) | Lost 0-2 | -121453 |
| 6standard | 224 | Wack, Quentin (1502) | Won 2-1 | +191472 |
| 7standard | 181 | Gurney, James (1748) | Lost 0-2 | -131459 |
| 8standard | 245 | Desille, Pauline (1470) | Lost 1-2 | -181441 |
| top | average opponent: 1578record: 4-4 | new rating: 1441 | ||
| Grand Prix Birmingham 2018 (leg) (legacy) | starting rating: 1411 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 324 | Puissant, Remi (1613) | Draw 1-1 | +41415 |
| 2legacy | 286 | Kallenborn, Jan (1463) | Lost 0-2 | -171398 |
| 3legacy | 498 | Denaxas, Stavros (1482) | Lost 0-2 | -171381 |
| 4legacy | 532 | Bridger, Charlie (1392) | Won 2-0 | +181399 |
| 5legacy | 443 | Wex, Jan-Philipp (1562) | Lost 0-2 | -151384 |
| 6legacy | 449 | Kesminaite, Aiste (1389) | Won 2-1 | +181402 |
| 7legacy | 348 | Palsio, Joonas (1458) | Won 2-1 | +191421 |
| 8legacy | 277 | Nieuwenhuis, Jordy (1515) | Draw 1-1 | +21423 |
| top | average opponent: 1484record: 3-3-2 | new rating: 1423 | ||
| Grand Prix Brussels 2015 (BFZ standard) | starting rating: 1463 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 333 | Edet, Johan (1433) | Draw 0-0 | 01463 |
| 2standard | 471 | Peters, Christian (1498) | Lost 0-0 | -181445 |
| 3standard | 803 | Cesana, Paolo (1427) | Lost 0-2 | -181427 |
| 4standard | 875 | Beel, Erwin (1464) | Won 2-1 | +191446 |
| 5standard | 747 | Douque, Tobias (1482) | Lost 1-2 | -181428 |
| 6standard | 733 | Wang, Olivier (1468) | Lost 1-2 | -171411 |
| top | average opponent: 1462record: 1-4-1 | new rating: 1411 | ||
| Grand Prix Utrecht 2015 (MM2 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 2298 | Niinisto, Juha (1431) | Lost 0-2 | -191481 |
| 2sealed | 2386 | Rollig, Niklas (1482) | Won 2-0 | +181499 |
| 3sealed | 2266 | Jacobs, Bob (1424) | Lost 1-2 | -201479 |
| 4sealed | 2368 | Schopman, Balthasar (1582) | Lost 1-2 | -161463 |
| top | average opponent: 1480record: 1-3 | new rating: 1463 | ||