Jacoby, David
Current rating: 1409
Record: 24-39-1
| Grand Prix Brussels 2020 (pioneer) | starting rating: 1354 | |||
| round | table | opponent (rating) | result | Δrating |
| 3pioneer | 25 | Szulborski, Michal (1462) | Lost 0-2 | -161338 |
| 4pioneer | 286 | Kramm, Stefan (1597) | Won 2-0 | +231361 |
| 5pioneer | 334 | Langer, Tim (1654) | Lost 1-2 | -131348 |
| 6pioneer | 415 | Nosenzo, Antonin (1589) | Won 2-0 | +221370 |
| 7pioneer | 182 | Vollebregt, Joost (1749) | Won 2-0 | +251395 |
| 8pioneer | 212 | Bohrkircher, Sascha (1768) | Won 2-1 | +241419 |
| 9pioneer | 137 | Magni, Luca (1859) | Lost 0-2 | -101409 |
| 10pioneer | 165 | Skornicki, Filip (1565) | Won 2-0 | +211430 |
| 11pioneer | 119 | Sodomirski, Tomasz (1707) | Lost 1-2 | -131417 |
| 12pioneer | 129 | Groot, Wessel (1632) | Won 2-0 | +221439 |
| 13pioneer | 92 | Lupalo, Kirill (1639) | Lost 0-2 | -151424 |
| 14pioneer | 123 | Zurlo, Claudio (1559) | Lost 1-2 | -151409 |
| top | average opponent: 1648record: 6-6 | new rating: 1409 | ||
| Grand Prix Utrecht 2019 (ELD limited) | starting rating: 1395 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 61 | Brandstetter, Hannes (1648) | Lost 1-2 | -131382 |
| 4sealed | 269 | Hessens, Oliver (1628) | Lost 1-2 | -141368 |
| 5sealed | 437 | Hovelmeier, Niklas (1578) | Lost 0-2 | -141354 |
| top | average opponent: 1618record: 0-3 | new rating: 1354 | ||
| Grand Prix Copenhagen 2019 (MH1 limited) | starting rating: 1418 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 85 | Twist, Lukas (1814) | Lost 0-2 | -121406 |
| 4sealed | 364 | Christensen, Mike Juel (1484) | Draw 1-1 | +21408 |
| 5sealed | 292 | Montanana, Vicente (1492) | Won 2-0 | +191427 |
| 6sealed | 182 | Brandt, Jeppe (1561) | Lost 0-2 | -151412 |
| 7sealed | 283 | Hernandez, Sebastian (1509) | Lost 0-2 | -171395 |
| top | average opponent: 1572record: 1-3-1 | new rating: 1395 | ||
| Grand Prix Strasbourg 2019 (RNA limited) | starting rating: 1366 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 269 | Otte, Julia (1568) | Won 2-0 | +221388 |
| 3sealed | 316 | Lippi, Alessandro (1751) | Won 2-0 | +241412 |
| 4sealed | 153 | Zvirblis, Rokas (1667) | Won 2-1 | +231435 |
| 5sealed | 73 | Wegenast, Silvan (1587) | Lost 1-2 | -151420 |
| 6sealed | 130 | Held, Marco (1682) | Won 2-1 | +221442 |
| 7sealed | 27 | Winner, Fabian (1661) | Lost 0-2 | -141428 |
| 8sealed | 235 | Barreaud, Joffrey (1853) | Lost 1-2 | -101418 |
| top | average opponent: 1681record: 4-3 | new rating: 1418 | ||
| Grand Prix Prague 2019 (UMA limited) | starting rating: 1397 | |||
| round | table | opponent (rating) | result | Δrating |
| 2sealed | 646 | Maurel, Fabien (1589) | Lost 0-2 | -151382 |
| 3sealed | 969 | Zubovich, Stanislau (1759) | Lost 1-2 | -111371 |
| 4sealed | 909 | Sarubbo, Simone (1482) | Lost 0-2 | -161355 |
| 5sealed | 944 | Polacchini, Rino (1466) | Won 2-0 | +201375 |
| 6sealed | 789 | Schreck, Alexander (1683) | Lost 0-2 | -131362 |
| 7sealed | 729 | Urset, Antoine (1538) | Won 2-0 | +221384 |
| 8sealed | 559 | Pohlmann, Susanne (1420) | Lost 1-2 | -181366 |
| top | average opponent: 1562record: 2-5 | new rating: 1366 | ||
| Grand Prix Prague 2018 (modern) | starting rating: 1439 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 121 | Kruijer, Silvan (1521) | Lost 0-2 | -161423 |
| 3modern | 462 | Henriksson, Per (1561) | Lost 0-2 | -161407 |
| 4modern | 721 | Akesson, Carl-Henrik (1551) | Lost 0-2 | -151392 |
| 5modern | 799 | Zeitzler, Anton (1465) | Won 2-1 | +191411 |
| 6modern | 681 | Marcopolo, Roma (1483) | Won 2-1 | +191430 |
| 7modern | 518 | Nurmagambetov, Timur (1509) | Lost 1-2 | -161414 |
| 8modern | 499 | Van Bochove, Ingo (1482) | Lost 0-2 | -171397 |
| top | average opponent: 1510record: 2-5 | new rating: 1397 | ||
| Grand Prix Lyon 2018 (modern) | starting rating: 1462 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 522 | Jedelhauser, Philipp (1626) | Lost 0-2 | -151447 |
| 2modern | 570 | Liotto, Daniele (1489) | Won 2-1 | +191466 |
| 3modern | 809 | Leskovsek, Svarun (1633) | Lost 0-2 | -151451 |
| 4modern | 814 | Bernocchi, Simone (1400) | Won 2-1 | +171468 |
| 5modern | 525 | Larsson, Michael (1229) | Won 2-0 | +141482 |
| 6modern | 523 | Ossorio Alfaro, Eduardo (1629) | Lost 0-2 | -161466 |
| 7modern | 641 | Amuzu, Marvin (1530) | Lost 1-2 | -161450 |
| 8modern | 612 | Gillet, Aurelien (1890) | Lost 0-2 | -111439 |
| top | average opponent: 1553record: 3-5 | new rating: 1439 | ||
| Grand Prix Metz 2017 (HOU limited) | starting rating: 1467 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 73 | Moeller, Marco (1535) | Lost 1-2 | -171450 |
| 2sealed | 404 | Gilles, Imboden (1482) | Won 2-1 | +191469 |
| 3sealed | 462 | van Ravenzwaaij, Don (1892) | Lost 1-2 | -111458 |
| 4sealed | 588 | Roux, Yohan (1486) | Won 2-0 | +191477 |
| 5sealed | 530 | Bini, Paolo (1738) | Lost 1-2 | -141463 |
| 6sealed | 485 | Welbourne, Markus (1360) | Won 2-0 | +161479 |
| 7sealed | 373 | Riegel, Julian (1519) | Won 2-1 | +191498 |
| 8sealed | 255 | Botzenhardt, Florian (1490) | Lost 0-2 | -181480 |
| 9sealed | 398 | Lissillour, Paul (1497) | Lost 0-2 | -181462 |
| top | average opponent: 1555record: 4-5 | new rating: 1462 | ||
| Grand Prix Utrecht 2017 (AER standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 242 | Chernykh, Vadim (1500) | Won 2-1 | +181518 |
| 2standard | 125 | Walukiewicz, Bartosz (1499) | Lost 0-2 | -181500 |
| 3standard | 326 | Lampadarios, Christoforos (1651) | Lost 1-2 | -161484 |
| 4standard | 564 | Huepper, Florian (1512) | Lost 1-2 | -171467 |
| 5standard | 517 | Christiaanse, Sander (1468) | Won 2-0 | +181485 |
| 6standard | 416 | Bos, Pepijn (1484) | Lost 1-2 | -181467 |
| top | average opponent: 1519record: 2-4 | new rating: 1467 | ||