Costan, Dan
Current rating: 1454
| Grand Prix Lyon 2018 (modern) | starting rating: 1507 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 511 | Truffaut, Clement (1484) | Lost 0-2 | -181489 |
| 2modern | 803 | Giorgetti, Cesare (1640) | Draw 1-1 | +21491 |
| 3modern | 851 | Hofer, Philip (1482) | Lost 0-2 | -181473 |
| 4modern | 950 | Ellis, David [ENG] (1427) | Lost 1-2 | -191454 |
| top | average opponent: 1508record: 0-3-1 | new rating: 1454 | ||
| Grand Prix Birmingham 2017 (modern) | starting rating: 1479 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 471 | Bainbridge, Simon (1456) | Won 2-0 | +181497 |
| 2modern | 324 | Griffiths, Pip (1777) | Won 0-0 | +231520 |
| 3modern | 240 | Wickham, Charles (1661) | Lost 0-2 | -161504 |
| 4modern | 276 | Beale, Gavin (1472) | Won 2-0 | +181522 |
| 5modern | 174 | Pike, Michael (1730) | Lost 1-2 | -141508 |
| 6modern | 400 | Arnold, Robert (1507) | Won 2-0 | +181526 |
| 7modern | 356 | Farinas Estudillo, Ruben (1552) | Lost 1-2 | -181508 |
| 8modern | 398 | Almeida, Tiago (1448) | Won 2-1 | +171525 |
| 9modern | 220 | Bhardwa, Shyam (1535) | Lost 1-2 | -181507 |
| top | average opponent: 1571record: 5-4 | new rating: 1507 | ||
| Grand Prix London 2016 (KLD limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 615 | Larkman, Christopher (1483) | Lost 0-2 | -181482 |
| 2sealed | 1012 | Kent, Declan (1430) | Lost 1-2 | -191463 |
| 3sealed | 1203 | Lambers, Florian (1465) | Won 2-0 | +181481 |
| 4sealed | 911 | Timmins, Liam (1415) | Won 2-0 | +171498 |
| 5sealed | 573 | Aklundh, Jens (1502) | Won 2-0 | +181516 |
| 6sealed | 658 | Solaja, Ivan (1527) | Lost 1-2 | -181498 |
| 7sealed | 700 | Whitehouse, Robert (1466) | Lost 1-2 | -191479 |
| top | average opponent: 1470record: 3-4 | new rating: 1479 | ||