Kostal, Zdenek
Current rating: 1457
Record: 17-20-3
| Grand Prix Prague 2016 (legacy) | starting rating: 1513 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 117 | Buchta, Rudolf (1486) | Draw 1-1 | 01513 |
| 2legacy | 305 | Haga, Viktor (1517) | Lost 1-2 | -181495 |
| 3legacy | 150 | De Keyzer, Frederik (1399) | Lost 0-2 | -201475 |
| 4legacy | 671 | Qvarsell, Jens (1464) | Lost 1-2 | -181457 |
| top | average opponent: 1466record: 0-3-1 | new rating: 1457 | ||
| Grand Prix Prague 2014 (modern) | starting rating: 1484 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 198 | Pulec, Ondrej (1500) | Won 2-0 | +181502 |
| 2modern | 10 | Castelli, Massimo (1475) | Won 2-0 | +181520 |
| 3modern | 169 | Panigada, Igor (1518) | Lost 1-2 | -181502 |
| 4modern | 381 | Alexandersson, Bjarki (1509) | Won 2-0 | +181520 |
| 5modern | 146 | Blumer, Yann (1694) | Won 2-0 | +211541 |
| 6modern | 92 | Steinborn, Robin (1872) | Lost 1-2 | -121529 |
| 7modern | 161 | Landoni, Nicola (1665) | Lost 1-2 | -161513 |
| top | average opponent: 1605record: 4-3 | new rating: 1513 | ||
| Grand Prix Prague 2013 (M14 limited) | starting rating: 1519 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 50 | Kladiva, Milan (1500) | Lost 0-2 | -181501 |
| 2sealed | 489 | Drobny, Radoslav (1587) | Won 2-0 | +201521 |
| 3sealed | 466 | Rut, Vaclav (1501) | Lost 1-2 | -191502 |
| 4sealed | 519 | Sasorov, Basil (1488) | Lost 1-2 | -181484 |
| top | average opponent: 1519record: 1-3 | new rating: 1484 | ||
| Grand Prix Amsterdam 2011 (legacy) | starting rating: 1499 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 53 | Barnes, Matt J (1447) | Won 2-0 | +171516 |
| 2legacy | 105 | den Bieman, Joost (1518) | Lost 0-2 | -181498 |
| 3legacy | 233 | Prats, Helene (1450) | Draw 1-1 | -11497 |
| 4legacy | 286 | van der Mandele, Joost (1603) | Won 2-0 | +201517 |
| 5legacy | 206 | Don V.R., (1501) | Won 2-1 | +181535 |
| 6legacy | 133 | Boer, Robbin (1677) | Lost 1-2 | -161519 |
| top | average opponent: 1533record: 3-2-1 | new rating: 1519 | ||
| Grand Prix Prague 2011 (NPH limited) | starting rating: 1501 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 689 | Kuchar, Tomas (1500) | Draw 1-1 | 01501 |
| 2sealed | 658 | Depouillon, Bert (1553) | Won 2-1 | +191520 |
| 3sealed | 597 | Kelterbaum, Morgane (1353) | Won 2-1 | +151535 |
| 4sealed | 581 | Attlfellner, Stefan (1605) | Lost 1-2 | -171518 |
| 5sealed | 631 | Vapenik, Karel (1445) | Lost 0-2 | -191499 |
| top | average opponent: 1491record: 2-2-1 | new rating: 1499 | ||
| Grand Prix Madrid 2010 (legacy) | starting rating: 1517 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 413 | Schorel, Kris (1500) | Won 2-1 | +171534 |
| 2legacy | 133 | Ljungberg, William (1765) | Lost 0-2 | -131521 |
| 3legacy | 224 | Bestard, Kat (1500) | Won 2-1 | +171538 |
| 4legacy | 150 | Cadei, Angelo (1501) | Lost 1-2 | -191519 |
| 5legacy | 355 | Santiago, Raul (1503) | Lost 0-2 | -181501 |
| top | average opponent: 1554record: 2-3 | new rating: 1501 | ||
| Grand Prix Prague 2009 (M10 limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 685 | Kinell, Andreas (1500) | Lost 0-2 | -181482 |
| 2sealed | 799 | Hallwirth, Stephan (1477) | Lost 0-2 | -181464 |
| 3sealed | 833 | Fitas, Mateusz (1462) | Won 2-0 | +181482 |
| 4sealed | 808 | Randis, Sarunas (1482) | Won 2-1 | +181500 |
| 5sealed | 739 | Pokorny, Jiri J (1499) | Lost 0-2 | -181482 |
| 6sealed | 760 | Jaglo, Tomasz (1487) | Lost 1-2 | -181464 |
| 7sealed | 723 | Aghai-khozani, Hossein (1464) | Won 2-0 | +181482 |
| 8sealed | 676 | Kelis, Martin (1413) | Won 2-0 | +171499 |
| 9sealed | 618 | Sedlacek, Michael (1500) | Won 2-1 | +181517 |
| top | average opponent: 1476record: 5-4 | new rating: 1517 | ||