Iwasaki, Mitsumasa
Current rating: 1485
Record: 43-51-5
| Grand Prix Nagoya 2020 (pioneer) | starting rating: 1469 | |||
| round | table | opponent (rating) | result | Δrating |
| 3pioneer | 303 | Kurashima, Kazuki (1722) | Won 2-1 | +221491 |
| 4pioneer | 83 | Imai, Yuutarou (1505) | Lost 1-2 | -171474 |
| 5pioneer | 119 | Ogawa, Shota (1696) | Won 2-0 | +211495 |
| 6pioneer | 127 | Kihara, Ryou (1719) | Lost 0-2 | -131482 |
| 7pioneer | 294 | Uchida, Seiya (1588) | Won 2-1 | +191501 |
| 8pioneer | 174 | Kondo, Go (1561) | Lost 0-2 | -161485 |
| top | average opponent: 1632record: 3-3 | new rating: 1485 | ||
| Grand Prix Nagoya 2019 (ELD standard) | starting rating: 1361 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 57 | Komiyama, Kouhei (1514) | Won 2-1 | +211382 |
| 4standard | 168 | Yokoyama, Takaya (1580) | Won 2-1 | +221404 |
| 5standard | 68 | Shirahata, Gen (1614) | Lost 0-2 | -151389 |
| 6standard | 205 | Sakai, Yuuki (1476) | Won 2-0 | +201409 |
| 7standard | 92 | Saito, Tomoharu (1977) | Won 2-1 | +271436 |
| 8standard | 55 | Hayakawa, Sho (1660) | Lost 0-2 | -141422 |
| 9standard | 134 | Maeda, Takuma (1613) | Won 2-1 | +221444 |
| 10standard | 98 | Shinohara, Gen 8933 (1768) | Lost 1-2 | -121432 |
| 11standard | 121 | Mimido, Ryuji (1560) | Lost 0-2 | -161416 |
| 12standard | 130 | Wakita, Tomoyuki (1745) | Won 2-0 | +241440 |
| 13standard | 83 | Moriya, Daisuke (1626) | Won 2-0 | +211461 |
| 14standard | 79 | Hiroi, Genki (1731) | Lost 1-2 | -131448 |
| 15standard | 88 | Soloviev, Valentin (1609) | Won 2-0 | +211469 |
| top | average opponent: 1652record: 8-5 | new rating: 1469 | ||
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1386 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 163 | Nagai, Mamoru (1786) | Lost 1-2 | -111375 |
| 4sealed | 691 | Murata, Atsushi (1640) | Lost 1-2 | -141361 |
| top | average opponent: 1713record: 0-2 | new rating: 1361 | ||
| Grand Prix Yokohama 2019 (modern) | starting rating: 1438 | |||
| round | table | opponent (rating) | result | Δrating |
| 3modern | 231 | Niitani, Nobuhide (1413) | Lost 1-2 | -191419 |
| 4modern | 503 | Iwashita, Shuta (1514) | Lost 0-2 | -161403 |
| 5modern | 557 | Hamamoto, Shouta (1436) | Lost 1-2 | -171386 |
| top | average opponent: 1454record: 0-3 | new rating: 1386 | ||
| Grand Prix Kyoto 2019 (RNA standard) | starting rating: 1450 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 382 | Maeda, Takuma (1529) | Lost 0-2 | -161434 |
| 4standard | 452 | Ohkawa, Yusuke (1612) | Lost 1-2 | -151419 |
| 5standard | 680 | Satou, Yoshinobu (1459) | Won 2-1 | +191438 |
| top | average opponent: 1533record: 1-2 | new rating: 1438 | ||
| Grand Prix Shizuoka 2018 (standard) (GRN standard) | starting rating: 1470 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 475 | Komanski, Nicolas (1667) | Lost 1-2 | -141456 |
| 4standard | 491 | Tomita, Ryutaro (1563) | Won 2-1 | +201476 |
| 5standard | 461 | Okada, Takuya 8592 (1533) | Won 2-0 | +191495 |
| 6standard | 417 | Mori, Takeshi (1704) | Lost 0-2 | -151480 |
| 7standard | 415 | Kokubun, Takeshi (1715) | Lost 1-2 | -131467 |
| 8standard | 554 | Kondo, Shogo (1567) | Lost 0-2 | -171450 |
| top | average opponent: 1625record: 2-4 | new rating: 1450 | ||
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1474 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 235 | Fukumoto, Nobuhiro (1716) | Lost 0-2 | -141460 |
| 4sealed | 462 | Takahashi, Taro (1561) | Lost 0-2 | -161444 |
| 5sealed | 838 | Lucas, Gertjan (1422) | Won 2-1 | +181462 |
| 6sealed | 380 | Hamada, Kouji (1474) | Won 2-0 | +181480 |
| 7sealed | 279 | Zheng, Peiyuan (1960) | Lost 0-2 | -101470 |
| top | average opponent: 1627record: 2-3 | new rating: 1470 | ||
| Grand Prix Kyoto 2017 (HOU limited) | starting rating: 1524 | |||
| round | table | opponent (rating) | result | Δrating |
| 3sealed | 425 | Nakamura, Masato (1470) | Lost 0-2 | -191505 |
| 4sealed | 508 | Iso, Toshiharu (1514) | Won 2-0 | +181523 |
| 5sealed | 184 | Hattori, Takesi (1451) | Lost 1-2 | -191504 |
| 6sealed | 661 | Gotou, Hiroaki (1717) | Lost 0-2 | -151489 |
| 7sealed | 693 | Hiwatashi, Yasurou (1618) | Won 2-1 | +211510 |
| 8sealed | 525 | Wakizaka, Hironari (1520) | Lost 0-2 | -181492 |
| 9sealed | 595 | Nakamura, Ryouta (1493) | Lost 1-2 | -181474 |
| top | average opponent: 1540record: 2-5 | new rating: 1474 | ||
| Grand Prix Kobe 2017 (modern) | starting rating: 1542 | |||
| round | table | opponent (rating) | result | Δrating |
| 3modern | 79 | Ishimaru, Naoki (1525) | Won 2-1 | +181560 |
| 4modern | 326 | O'Keefe, Mitchell (1627) | Lost 0-2 | -171543 |
| 5modern | 298 | Takahashi, Masataka (1507) | Lost 1-2 | -181525 |
| 6modern | 772 | Fujino, Masashi (1489) | Lost 1-2 | -191506 |
| 7modern | 893 | Kim, Chan-uk (1426) | Won 2-1 | +171523 |
| 8modern | 583 | Hayakawa, Tatsuya (1515) | Won 2-0 | +171540 |
| 9modern | 322 | Yuba, Takayuki (1611) | Lost 0-2 | -161524 |
| top | average opponent: 1528record: 3-4 | new rating: 1524 | ||
| Grand Prix Shizuoka 2017 (AER standard) | starting rating: 1566 | |||
| round | table | opponent (rating) | result | Δrating |
| 2standard | 596 | Furuuchi, Kaoru (1536) | Won 2-1 | +181584 |
| 3standard | 266 | Iwaide, Yoshitaka (1565) | Won 2-0 | +171601 |
| 4standard | 160 | Okamoto, Katsuki (1534) | Won 2-0 | +171618 |
| 5standard | 161 | Matsuzaki, Ryuta (1497) | Won 2-1 | +161634 |
| 6standard | 68 | Sasabe, Yusuke (1637) | Lost 0-2 | -181616 |
| 7standard | 52 | Li, Fabien (1771) | Lost 0-2 | -151601 |
| 8standard | 197 | Nishida, Masahiro (1481) | Lost 0-2 | -201581 |
| 9standard | 318 | Ueno, Hideto (1355) | Won 2-0 | +141595 |
| 10standard | 313 | Tateno, Takayuki (1600) | Lost 1-2 | -181577 |
| 11standard | 397 | Ishihara, Takashi (1493) | Lost 1-2 | -201557 |
| 12standard | 375 | Isayama, Yusuke (1578) | Lost 0-2 | -181539 |
| 13standard | 336 | Morita, Yo (1716) | Lost 1-2 | -141525 |
| 14standard | 316 | Deguchi, Koya (1518) | Won 2-0 | +181543 |
| 15standard | 285 | Segou, Kenji (1541) | Draw 1-1 | -11542 |
| top | average opponent: 1559record: 6-7-1 | new rating: 1542 | ||
| Grand Prix Tokyo 2016 (SOI standard) | starting rating: 1535 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 1048 | Nose, Kouta (1506) | Lost 0-2 | -191516 |
| 2standard | 825 | Jo, Kyu Sung (1481) | Won 2-0 | +171533 |
| 3standard | 1055 | Minamizuka, Yuusuke (1495) | Draw 1-1 | 01533 |
| 4standard | 1085 | Conde-Gonzalez, Francisco Antonio (1530) | Draw 1-1 | 01533 |
| 5standard | 1267 | Ikeda, Kengo (1474) | Won 2-1 | +171550 |
| 6standard | 978 | Kodama, Yuuki (1520) | Draw 1-1 | -11549 |
| 7standard | 1099 | Ota, Sho (1598) | Won 2-0 | +191568 |
| 8standard | 618 | Tomita, Ryutaro (1522) | Won 2-0 | +171585 |
| 9standard | 492 | Isigami, Laito (1535) | Lost 1-2 | -191566 |
| top | average opponent: 1518record: 4-2-3 | new rating: 1566 | ||
| Grand Prix Nagoya 2016 (OGW limited) | starting rating: 1461 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 628 | Yahara, Shotaro (1368) | Won 2-0 | +161477 |
| 2sealed | 7 | Murakami, Souta (1531) | Lost 0-2 | -171460 |
| 3sealed | 784 | Hagino, Akira (1500) | Won 2-0 | +191479 |
| 4sealed | 620 | Lee, Rick Hup Beng (1812) | Won 2-0 | +241503 |
| 5sealed | 536 | Koyama, Kenta (1801) | Lost 1-2 | -131490 |
| 6sealed | 587 | Tabata, Yuusuke (1562) | Won 2-1 | +191509 |
| 7sealed | 513 | Hagino, Ryouta (1536) | Lost 1-2 | -171492 |
| 8sealed | 670 | Magata, Kazuto (1578) | Won 2-0 | +191511 |
| 9sealed | 286 | Itou, Makoto (1433) | Won 2-1 | +171528 |
| 10draft | 90 | Tamura, Ryo (1781) | Lost 0-2 | -141514 |
| 11draft | 276 | Tsuzaki, Akira (1515) | Won 2-0 | +181532 |
| 12draft | 362 | Kotani, Kazuki (1564) | Won 2-1 | +191551 |
| 13draft | 284 | Urano, Syouhei (1527) | Won 2-1 | +181569 |
| 14draft | 292 | Teshima, Hisanori (1502) | Lost 1-2 | -201549 |
| 15draft | 99 | Kokubun, Hiroshi (1728) | Lost 0-2 | -141535 |
| top | average opponent: 1582record: 9-6 | new rating: 1535 | ||
| Grand Prix Kobe 2015 (BFZ standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 290 | Rentaro, Koyama (1500) | Lost 0-2 | -181482 |
| 2standard | 868 | Mori, Arashi (1480) | Lost 1-2 | -181464 |
| 3standard | 1074 | Ono, Ikumi (1438) | Won 2-0 | +181482 |
| 4standard | 1040 | Hosokawa, Soichiro (1437) | Lost 1-2 | -191463 |
| 5standard | 1013 | Ono, Syouhei (1463) | Draw 1-1 | 01463 |
| 6standard | 923 | Gondo, Kosuke (1466) | Lost 1-2 | -181445 |
| 7standard | 799 | Iwata, Riki (1439) | Lost 1-2 | -181427 |
| 8standard | 686 | Nakamura, Yuta7609 (1421) | Won 2-0 | +181445 |
| 9standard | 557 | Oku, Kousuke (1345) | Won 2-0 | +161461 |
| top | average opponent: 1443record: 3-5-1 | new rating: 1461 | ||