Petrjanos, Josef
Current rating: 1509
Record: 4-4
| Grand Prix Prague 2018 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 48 | Wilson, Matt (1534) | Won 2-0 | +191519 |
| 2modern | 368 | Silva, Marco (1400) | Lost 0-2 | -211498 |
| 3modern | 808 | Cordeschi, Nicola (1491) | Won 2-1 | +181516 |
| 4modern | 529 | Stradner, Stefan (1840) | Lost 1-2 | -121504 |
| 5modern | 455 | Kraus, Marcin (1502) | Won 2-1 | +181522 |
| 6modern | 576 | Harezlak, Wiktor (1602) | Won 2-0 | +191541 |
| 7modern | 338 | Le Briand, Loic (1833) | Lost 0-2 | -121529 |
| 8modern | 411 | Ebenhoch, Joschka (1457) | Lost 1-2 | -201509 |
| average opponent: 1582record: 4-4 | new rating: 1509 | |||