Kupfer, David
Current rating: 1493
Record: 5-6-1
| Grand Prix Prague 2019 (UMA limited) | starting rating: 1521 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 593 | Brozek, Jan (1915) | Lost 0-2 | -121509 |
| 2sealed | 1339 | Steinbeiss, Alexander (1421) | Lost 0-2 | -191490 |
| 3sealed | 1077 | Weber, Patrick (1513) | Won 2-0 | +181508 |
| 4sealed | 1009 | Reiter, Florian (1686) | Lost 0-2 | -151493 |
| average opponent: 1634record: 1-3 | new rating: 1493 | |||
| Grand Prix Prague 2018 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 380 | Sanchez, Diego (1587) | Lost 1-2 | -161484 |
| 2modern | 602 | Andrenacci, Gianmarco (1447) | Lost 0-2 | -191465 |
| 3modern | 964 | Renkielski, Adam (1508) | Won 2-0 | +191484 |
| 4modern | 806 | Kokoska, Mindaugas (1481) | Won 2-1 | +181502 |
| 5modern | 723 | Gonzalez Trejo, Luis Antonio (1475) | Won 2-1 | +171519 |
| 6modern | 508 | Vrooman, Jacob (1533) | Won 2-1 | +181537 |
| 7modern | 178 | Bjorklund, Charles (1651) | Lost 1-2 | -161521 |
| 8modern | 413 | Reina, Daniel (1475) | Draw 1-1 | 01521 |
| average opponent: 1520record: 4-3-1 | new rating: 1521 | |||