Tamminga, Mark
Current rating: 1449
Record: 7-10
| Grand Prix Rotterdam 2009 (CON limited) | starting rating: 1483 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 512 | Muller, Jack-daniel (1500) | Won 2-1 | +191502 |
| 2sealed | 515 | Doropoulos, Marios-Isidoros (1535) | Lost 0-2 | -181484 |
| 3sealed | 523 | Driever, David (1505) | Lost 0-2 | -171467 |
| 4sealed | 608 | Stellingwerf, Allard (1483) | Lost 0-2 | -181449 |
| top | average opponent: 1506record: 1-3 | new rating: 1449 | ||
| Grand Prix Copenhagen 2002 (ONS rochester) | starting rating: 1520 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 29 | Los, Vincent (1483) | Lost 1-2 | -191501 |
| 3sealed | 162 | Strand, Bjorn-Olav (1501) | Lost 0-2 | -181483 |
| top | average opponent: 1492record: 0-2 | new rating: 1483 | ||
| Grand Prix Antwerp 2002 (TOR limited) | starting rating: 1499 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 16 | Syzel, Barbara (1500) | Lost 0-2 | -181481 |
| 2sealed | 166 | Locard, Olivier (1415) | Won 2-0 | +171498 |
| 3sealed | 154 | Van der Auwera, Bert (1534) | Won 2-0 | +181516 |
| 4sealed | 150 | Schrama, Patrick (1625) | Won 2-1 | +201536 |
| 5sealed | 92 | Haim, Christophe (1635) | Lost 0-2 | -161520 |
| top | average opponent: 1542record: 3-2 | new rating: 1520 | ||
| Grand Prix Amsterdam 2001 (INV limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 141 | Knegt, Daniel (1500) | Won 2-0 | +181518 |
| 2sealed | 136 | Verstuyft, Bart (1518) | Won 2-0 | +181536 |
| 3sealed | 31 | Kajdas, Oskar (1536) | Won 2-0 | +181554 |
| 4sealed | 61 | Genders, Bart (1502) | Lost 0-2 | -191535 |
| 5sealed | 119 | Steinbusch, Stefan (1519) | Lost 1-2 | -181517 |
| 6sealed | 108 | de Boer, Wim (1518) | Lost 1-2 | -181499 |
| top | average opponent: 1515record: 3-3 | new rating: 1499 | ||