Blumer, David
Current rating: 1523
Record: 30-29
| Grand Prix London 2016 (KLD limited) | starting rating: 1563 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 71 | Cox, Albert (1500) | Won 2-1 | +171580 |
| 2sealed | 481 | Restoy, Lluis (1649) | Lost 0-2 | -171563 |
| 3sealed | 1004 | Bollinger, Isabelle (1521) | Lost 1-2 | -191544 |
| 4sealed | 1021 | Leahy, Daisy (1448) | Won 2-1 | +171561 |
| 5sealed | 675 | Gerth, Christopher (1534) | Lost 0-2 | -191542 |
| 6sealed | 851 | Dashti, Belal (1483) | Lost 0-2 | -191523 |
| top | average opponent: 1523record: 2-4 | new rating: 1523 | ||
| Grand Prix Utrecht 2015 (MM2 limited) | starting rating: 1546 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 141 | Nouhaili, Badr (1446) | Won 2-0 | +161562 |
| 2sealed | 53 | Terrier, Lucas (1615) | Lost 1-2 | -171545 |
| 3sealed | 395 | Shadbolt, Robert (1503) | Won 2-0 | +171562 |
| 4sealed | 382 | Schroder, Michael [DNK] (1593) | Won 2-1 | +191581 |
| 5sealed | 164 | Houthuijsen, Jasper (1574) | Won 2-1 | +181599 |
| 6sealed | 113 | Janecka, Ondrej (1680) | Lost 0-2 | -171582 |
| 7sealed | 132 | McGhin, Kieran (1511) | Lost 1-2 | -191563 |
| top | average opponent: 1560record: 4-3 | new rating: 1563 | ||
| Grand Prix Milan 2014 (JOU limited) | starting rating: 1545 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 157 | Vella, Alessio (1435) | Lost 1-2 | -201525 |
| 2sealed | 313 | crifo, adriano (1481) | Won 2-0 | +171542 |
| 3sealed | 438 | Maurer, Tobias (1644) | Won 2-0 | +201562 |
| 4sealed | 240 | Ahkaloo, Jhayshan (1626) | Lost 0-2 | -171545 |
| 5sealed | 371 | Albesiano, Enrico (1594) | Won 2-0 | +191564 |
| 6sealed | 319 | Golikova, Ekaterina (1563) | Lost 0-2 | -181546 |
| top | average opponent: 1557record: 3-3 | new rating: 1546 | ||
| Grand Prix Vienna 2014 (BNG limited) | starting rating: 1581 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 72 | Sikorski, Jerzy (1527) | Lost 1-2 | -191562 |
| 2sealed | 344 | Vila, Ferran (1776) | Won 2-1 | +221584 |
| 3sealed | 323 | Seljak, Samo (1567) | Lost 0-2 | -181566 |
| 4sealed | 439 | Ruhland, Michael (1419) | Lost 1-2 | -211545 |
| top | average opponent: 1572record: 1-3 | new rating: 1545 | ||
| Grand Prix Vienna 2013 (THS standard) | starting rating: 1570 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 221 | Hildebrandt, Mara (1500) | Won 2-0 | +171587 |
| 2standard | 308 | Habert, Alexandre (1709) | Won 2-1 | +201607 |
| 3standard | 325 | Jathe, Nicolas (1781) | Lost 1-2 | -151592 |
| 4standard | 439 | Binder, Christian (1503) | Won 2-0 | +161608 |
| 5standard | 146 | Pajak, Tomasz (1545) | Lost 1-2 | -191589 |
| 6standard | 442 | Kuntze, Maximilian (1520) | Won 2-0 | +171606 |
| 7standard | 333 | Kedrovic, Ondrej (1461) | Won 2-1 | +151621 |
| 8standard | 127 | Weilguni, Sascha (1492) | Lost 0-2 | -201601 |
| 9standard | 226 | Mottaghipour, Sasan (1494) | Lost 1-2 | -201581 |
| top | average opponent: 1556record: 5-4 | new rating: 1581 | ||
| Grand Prix Milan 2011 (ISD limited) | starting rating: 1501 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 603 | Vaitmaa, Eero-Jaak (1500) | Won 2-1 | +181519 |
| 2sealed | 714 | Brea, Jorge (1609) | Won 2-0 | +201539 |
| 3sealed | 570 | Katushonak, Egor (1536) | Won 2-1 | +171556 |
| 4sealed | 533 | Cammalleri, Antonio (1555) | Won 2-0 | +181574 |
| 5sealed | 553 | Tzirinis, Panagiotis (1573) | Won 2-0 | +181592 |
| 6sealed | 508 | Wallendorf, Jonas (1806) | Lost 1-2 | -141578 |
| 7sealed | 561 | Gaviglio, Luca (1662) | Lost 0-2 | -161562 |
| 8sealed | 608 | Nesi, Eugenio (1797) | Won 2-1 | +221584 |
| 9sealed | 575 | Stok, Alex (1607) | Won 2-1 | +181602 |
| 10sealed | 550 | Espenes, Vidar (1574) | Lost 0-2 | -181584 |
| 11draft | 39 | Nilsson, Johannes (1580) | Lost 0-0 | -181566 |
| 12draft | 53 | Costa, Nuno (1647) | Won 2-1 | +191585 |
| 13draft | 4 | Kotowicz, Lukasz (1610) | Won 2-0 | +191604 |
| 14draft | 88 | Lozano Carreras, Xavier (1755) | Lost 0-2 | -151589 |
| 15draft | 69 | Janeczek, Jakub (1557) | Lost 0-2 | -191570 |
| top | average opponent: 1625record: 9-6 | new rating: 1570 | ||
| Grand Prix Lyon 2010 (ROE limited) | starting rating: 1513 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 213 | Cambriels, Pierre-Arnaud (1502) | Won 2-0 | +181531 |
| 2sealed | 153 | Puthod, Jerome (1619) | Won 2-1 | +201551 |
| 3sealed | 35 | Rampini, Stefano (1739) | Lost 0-2 | -151536 |
| 4sealed | 124 | Santinelli, Enrico (1578) | Lost 1-2 | -171519 |
| 5sealed | 174 | Lacouture, Alexandre (1522) | Lost 1-2 | -181501 |
| top | average opponent: 1592record: 2-3 | new rating: 1501 | ||
| Grand Prix Paris 2009 (ZEN limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 672 | Fattahi, Hedi (1500) | Lost 0-2 | -181482 |
| 2sealed | 975 | Maillard, Gregory (1380) | Won 2-0 | +161498 |
| 3sealed | 924 | Lebarque, Sebastien (1464) | Won 2-1 | +181516 |
| 4sealed | 835 | Fletcher, Joe (1517) | Won 2-1 | +181534 |
| 5sealed | 717 | Martin, Nicolas (1486) | Lost 1-2 | -191515 |
| 6sealed | 761 | Benoit, Cyril (1451) | Won 2-0 | +171532 |
| 7sealed | 714 | Sundberg, Erik (1520) | Lost 1-2 | -191513 |
| top | average opponent: 1474record: 4-3 | new rating: 1513 | ||