Vilhjalmsson, Halldor
Current rating: 1478
Record: 17-19-1
| Grand Prix Copenhagen 2017 (modern) | starting rating: 1511 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 140 | Hoie Ostrem, Stian (1500) | Won 2-1 | +181529 |
| 2modern | 243 | Vidal Ros, Jose (1671) | Lost 1-2 | -151514 |
| 3modern | 676 | Webels, Richard (1672) | Lost 0-2 | -161498 |
| 4modern | 817 | Mikkelsen, Kenneth (1481) | Won 2-1 | +181516 |
| 5modern | 516 | Taaje, Stian (1484) | Lost 0-2 | -191497 |
| 6modern | 614 | Rathjen, Tim-Eric (1431) | Lost 0-2 | -191478 |
| top | average opponent: 1540record: 2-4 | new rating: 1478 | ||
| Grand Prix Stockholm 2016 (EMN limited) | starting rating: 1506 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 48 | Arndt, Jens (1593) | Won 2-0 | +201526 |
| 2sealed | 68 | Hylander, David (1624) | Lost 0-2 | -171509 |
| 3sealed | 279 | Szczerbinski, Dominik (1503) | Won 2-0 | +181527 |
| 4sealed | 321 | Lyahovets, Mikhail (1525) | Won 2-0 | +181545 |
| 5sealed | 183 | Forslund, Fredrik (1612) | Won 2-0 | +191564 |
| 6sealed | 103 | Adolfsson, Kristjan (1566) | Lost 1-2 | -181546 |
| 7sealed | 174 | Seidel, Christian (1469) | Won 2-1 | +171563 |
| 8sealed | 70 | Schipkowski, Jan (1680) | Lost 1-2 | -161547 |
| 9sealed | 143 | Lange, Holger (1552) | Won 2-1 | +181565 |
| 10draft | 40 | Hylander, David (1652) | Lost 0-2 | -161549 |
| 11draft | 39 | Queralt Martin, Albert (1460) | Lost 0-2 | -201529 |
| 12draft | 38 | Nakki, Simo (1522) | Lost 0-2 | -181511 |
| top | average opponent: 1563record: 6-6 | new rating: 1511 | ||
| Grand Prix Manchester 2016 (SOI standard) | starting rating: 1481 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 373 | Plimmer, Justin (1522) | Won 2-1 | +181499 |
| 2standard | 69 | Friedli, Johan (1477) | Lost 0-1 | -181481 |
| 3standard | 594 | Tate, Gavin (1482) | Lost 1-2 | -181463 |
| 4standard | 609 | Boothroyd, Jason (1482) | Won 2-0 | +181481 |
| 5standard | 434 | Baxendale, Matthew (1389) | Won 2-0 | +171498 |
| 6standard | 302 | Roberts, Tom (1515) | Won 2-1 | +181516 |
| 7standard | 260 | Mavridis, Lazaros (1600) | Won 2-0 | +201536 |
| 8standard | 98 | Punter, Mark (1501) | Lost 1-2 | -191517 |
| 9standard | 324 | Hill, Iwan (1537) | Won 2-0 | +181535 |
| 10standard | 193 | Marciano, Giancarlo (1706) | Lost 1-2 | -151520 |
| 11standard | 217 | Esser, Florian (1473) | Lost 0-2 | -181502 |
| 12standard | 203 | Schepman, Patrick (1440) | Won 2-0 | +161518 |
| 13standard | 174 | Antoniou, Daniel (1839) | Lost 1-2 | -121506 |
| top | average opponent: 1535record: 7-6 | new rating: 1506 | ||
| Grand Prix Copenhagen 2015 (modern) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 60 | Nyberg, Filip (1500) | Won 2-1 | +181518 |
| 2modern | 28 | Arkheden, Axel (1518) | Lost 1-2 | -181500 |
| 3modern | 300 | Hyldig, Morten (1484) | Draw 1-1 | 01500 |
| 4modern | 431 | Holmstedt, Rolf (1368) | Lost 1-2 | -211479 |
| 5modern | 518 | Olsson, Daniel (1468) | Won 2-0 | +181497 |
| 6modern | 396 | Schraut, Andreas (1586) | Lost 0-2 | -161481 |
| top | average opponent: 1487record: 2-3-1 | new rating: 1481 | ||