Conka, Stefan
Current rating: 1511
Record: 23-26-6
| Grand Prix Prague 2015 (ORI standard) | starting rating: 1527 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 138 | Corda, Adrien (1629) | Lost 0-2 | -161511 |
| top | record: 0-1 | new rating: 1511 | ||
| Grand Prix Vienna 2008 (extended) | starting rating: 1449 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 2 | Ohlmann, Daniel (1450) | Lost 0-2 | -181431 |
| 2extended | 221 | Jedo, Grzegorz (1412) | Won 2-0 | +171448 |
| 3extended | 125 | Hanzlik, Richard (1499) | Draw 1-1 | +11449 |
| 4extended | 189 | Shaw, Patrick J (1487) | Won 2-1 | +191468 |
| 5extended | 136 | Posavi, Andrej (1469) | Won 2-1 | +181486 |
| 6extended | 82 | Jeschke, Benjamin (1598) | Draw 1-1 | +21488 |
| 7extended | 123 | Godlewski, Jaroslaw (1534) | Won 2-0 | +191507 |
| 8extended | 84 | Trappe, Alexander (1635) | Draw 1-1 | +21509 |
| 9extended | 80 | Milicevic, Aris (1487) | Won 2-1 | +181527 |
| top | average opponent: 1508record: 5-1-3 | new rating: 1527 | ||
| Grand Prix Bologna 2005 (SOK limited) | starting rating: 1420 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 78 | Giunta, Giacomo (1500) | Won 2-0 | +191439 |
| 2sealed | 107 | Maggi, Stefano (1518) | Won 2-1 | +201459 |
| 3sealed | 24 | Perbet, Guillaume (1603) | Lost 0-2 | -161443 |
| 4sealed | 150 | Bergamaschi, Paolo (1505) | Lost 1-2 | -161427 |
| 5sealed | 166 | Cielo, Francesco (1468) | Lost 0-2 | -181409 |
| 6sealed | 204 | Caporali, Tommaso (1464) | Won 2-0 | +191428 |
| 7sealed | 132 | Pieroni, Federico (1503) | Draw 1-1 | +21430 |
| 8sealed | 118 | Splendori, Giuseppe (1485) | Won 2-0 | +191449 |
| top | average opponent: 1506record: 4-3-1 | new rating: 1449 | ||
| Grand Prix Leipzig 2005 (BOK limited) | starting rating: 1429 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 130 | Renko, Andrej (1409) | Draw 1-1 | 01429 |
| 2sealed | 119 | Karlinski, Anton (1510) | Won 2-0 | +191448 |
| 3sealed | 72 | Hrdlicka, Zdenek (1474) | Won 2-1 | +191467 |
| 4sealed | 51 | Reitbauer, Sascha (1536) | Won 2-1 | +191486 |
| 5sealed | 27 | Kiesewetter, David (1552) | Lost 1-2 | -171469 |
| 6sealed | 61 | Netrefa, Jiri (1569) | Lost 1-2 | -161453 |
| 7sealed | 85 | Geidel, Jerome (1526) | Lost 0-2 | -171436 |
| 8sealed | 91 | Gethke, Sebastian (1517) | Lost 0-2 | -161420 |
| top | average opponent: 1512record: 3-4-1 | new rating: 1420 | ||
| Grand Prix Vienna 2004 (COK limited) | starting rating: 1395 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 41 | Dukic, Mirko (1500) | Draw 1-1 | +21397 |
| 2sealed | 242 | Fiedler, Henning (1618) | Lost 1-2 | -141383 |
| 3sealed | 373 | Djordjevic, Rok (1483) | Won 2-1 | +201403 |
| 4sealed | 309 | Traschwandtner, Georg (1500) | Lost 0-2 | -161387 |
| 5sealed | 353 | Polyak, Mate (1484) | Won 2-0 | +191406 |
| 6sealed | 310 | Pucher, Gernot (1483) | Won 2-0 | +201426 |
| 7sealed | 199 | Van Uffelen, Lars (1517) | Won 2-1 | +191445 |
| 8sealed | 139 | Hugony, Francesco (1543) | Lost 1-2 | -161429 |
| top | average opponent: 1516record: 4-3-1 | new rating: 1429 | ||
| Grand Prix Zurich 2004 (Mirrodin block) | starting rating: 1398 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 5 | Schwerz, Robert (1500) | Lost 1-2 | -161382 |
| 2block | 169 | Bacha, Turik (1482) | Won 2-1 | +201402 |
| 3block | 219 | Todesco, Daja (1500) | Won 2-1 | +201422 |
| 4block | 87 | Desprez, Kevin (1651) | Won 2-0 | +221444 |
| 5block | 122 | Blandin, Alexis (1542) | Lost 0-2 | -161428 |
| 6block | 120 | Lewandowski, Mathias (1518) | Lost 0-2 | -171411 |
| 7block | 130 | de Jong, Sven (1521) | Lost 0-2 | -161395 |
| top | average opponent: 1530record: 3-4 | new rating: 1395 | ||
| Grand Prix Hamburg 2002 (Odyssey block) | starting rating: 1431 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 119 | Nielsen, Brian (1463) | Lost 0-2 | -171414 |
| 2block | 222 | van Bemmel, Simon (1465) | Won 2-1 | +191433 |
| 3block | 84 | Larsen, Michael (1366) | Lost 1-2 | -191414 |
| 4block | 225 | Kristensen, Dennis (1557) | Lost 0-2 | -161398 |
| top | average opponent: 1463record: 1-3 | new rating: 1398 | ||
| Grand Prix Vienna 2001 (ODY limited) | starting rating: 1482 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 44 | Thyringer, Andreas (1500) | Won 2-0 | +191501 |
| 2sealed | 108 | Fritz Kunc, Ziga (1604) | Lost 0-2 | -161485 |
| 3sealed | 187 | Birner, Armin (1500) | Lost 1-2 | -181467 |
| 4sealed | 257 | Oyntzen, Lars (1485) | Lost 0-2 | -181449 |
| 5sealed | 244 | Glavnik, Luka (1464) | Lost 0-2 | -181431 |
| top | average opponent: 1510record: 1-4 | new rating: 1431 | ||
| Grand Prix Prague 2001 (PLS limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 26 | Shavlovsky, Dmitriy (1518) | Lost 0-2 | -181482 |
| 2sealed | 277 | Klaudy, Jiri (1482) | Lost 0-2 | -181464 |
| 3sealed | 261 | Marek, Janca (1464) | Won 2-1 | +181482 |
| 4sealed | 215 | Lysak, Zdenek (1482) | Lost 1-2 | -181464 |
| 5sealed | 243 | Kruger, Sebastian (1464) | Won 2-1 | +181482 |
| top | average opponent: 1482record: 2-3 | new rating: 1482 | ||