Jansen, Jaco
Current rating: 1444
Record: 16-19
| Grand Prix London 2019 (WAR sealed) | starting rating: 1531 | |||
| round | table | opponent (rating) | result | Δrating |
| A1sealed | 67 | Tavera, Jorge (1611) | Lost 1-2 | -161515 |
| A2sealed | 339 | Kristensen, Frederik Kirk (1427) | Lost 0-2 | -201495 |
| A3sealed | 258 | Lehmacher, Max (1302) | Lost 0-2 | -211474 |
| C1sealed | 171 | Baker, Mathew (1420) | Won 2-0 | +171491 |
| C2sealed | 83 | Christiansen, Emil Castro (1508) | Lost 0-2 | -181473 |
| C3sealed | 317 | Gauthier, Guillaume (1789) | Lost 0-2 | -121461 |
| C4sealed | 278 | Carola, Filipa (1543) | Lost 1-2 | -171444 |
| top | average opponent: 1514record: 1-6 | new rating: 1444 | ||
| Grand Prix Utrecht 2015 (MM2 limited) | starting rating: 1558 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 78 | Broekman, Terence (1500) | Won 2-0 | +171575 |
| 2sealed | 240 | Richards, Branoc (1485) | Lost 0-2 | -201555 |
| 3sealed | 465 | Pikanitos, Romain (1485) | Won 2-1 | +171572 |
| 4sealed | 251 | Wondergem, Marc (1517) | Lost 0-2 | -191553 |
| 5sealed | 484 | Shemilt, Samantha (1502) | Won 2-0 | +171570 |
| 6sealed | 347 | Bonet, Irene (1432) | Lost 1-2 | -201550 |
| 7sealed | 298 | Zantema, Kobus (1535) | Lost 1-2 | -191531 |
| top | average opponent: 1494record: 3-4 | new rating: 1531 | ||
| Grand Prix Paris 2008 (ALA limited) | starting rating: 1524 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 592 | Puthod, Jerome (1517) | Lost 1-2 | -191505 |
| 2sealed | 789 | George, Jean Sebastien (1482) | Won 2-0 | +181523 |
| 3sealed | 658 | Legal, Maxime (1501) | Won 2-0 | +181541 |
| 4sealed | 697 | Ritti, Juliette (1522) | Won 2-0 | +171558 |
| 5sealed | 575 | Rosada, Adrian (1602) | Won 2-0 | +191577 |
| 6sealed | 535 | Cnotalski, Artur (1519) | Lost 1-2 | -191558 |
| top | average opponent: 1524record: 4-2 | new rating: 1558 | ||
| Grand Prix Brussels 2008 (SHM limited) | starting rating: 1523 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 163 | Hinterdorfer, Clemens (1518) | Won 2-1 | +181541 |
| 2sealed | 71 | Seine, Markus (1631) | Lost 0-2 | -171524 |
| 3sealed | 141 | Bresser, Nick (1482) | Won 2-0 | +181542 |
| 4sealed | 140 | Claudel, Maxime (1516) | Lost 1-2 | -191523 |
| 5sealed | 229 | De Leeuw, Marc-andre (1496) | Won 2-1 | +181541 |
| 6sealed | 157 | Rotsaert, Jeremy (1591) | Lost 1-2 | -171524 |
| top | average opponent: 1539record: 3-3 | new rating: 1524 | ||
| Grand Prix Strasbourg 2007 (Time Spiral block) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 98 | Millon, Gregory (1519) | Won 2-1 | +181518 |
| 2block | 16 | Colson, Flavien (1525) | Won 2-0 | +181536 |
| 3block | 70 | Chelil, Mehdi (1536) | Lost 1-2 | -181518 |
| 4block | 134 | eang, sakkoma (1518) | Lost 1-2 | -181500 |
| 5block | 160 | Adam, Philippe (1502) | Won 2-1 | +181518 |
| 6block | 118 | Thiel, Michael (1519) | Lost 0-2 | -181500 |
| 7block | 157 | Casamitjana, Tony (1478) | Won 2-1 | +181518 |
| 8block | 106 | Soubrier, Stephane (1795) | Lost 1-2 | -131505 |
| 9block | 112 | Gerardin, Adrien (1496) | Won 2-1 | +181523 |
| top | average opponent: 1543record: 5-4 | new rating: 1523 | ||