Iwasa, Kouhei
Current rating: 1379
Record: 10-18-3
| Grand Prix Shizuoka 2018 (legacy) (legacy) | starting rating: 1390 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 303 | Akagi, Takaaki (1354) | Won 2-0 | +181408 |
| 2legacy | 116 | Suzuki, Shinji (1502) | Lost 0-2 | -171391 |
| 3legacy | 455 | Sakurai, Atsushi (1347) | Draw 1-1 | 01391 |
| 4legacy | 449 | Takahashi, Kazuki (1463) | Lost 0-2 | -171374 |
| 5legacy | 536 | Yamazaki, Shuhei (1483) | Won 2-1 | +201394 |
| 6legacy | 419 | Sano, Masaya (1373) | Lost 0-2 | -191375 |
| 7legacy | 428 | Ido, Daiki (1447) | Lost 0-2 | -161359 |
| 8legacy | 415 | Ohashi, Ryo (1459) | Won 1-0 | +201379 |
| top | average opponent: 1428record: 3-4-1 | new rating: 1379 | ||
| Grand Prix Kobe 2017 (modern) | starting rating: 1420 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 627 | Kawasaki, Masatsugu (1518) | Won 2-0 | +201440 |
| 2modern | 329 | Hiroi, Yuta (1367) | Lost 1-2 | -201420 |
| 3modern | 959 | Ito, Takeaki (1439) | Won 2-0 | +191439 |
| 4modern | 751 | Yoshida, Yutarou (1507) | Lost 0-2 | -171422 |
| 5modern | 1047 | Ito, Hajime (1558) | Lost 1-2 | -161406 |
| 6modern | 902 | Nishiyama, Takashi (1512) | Lost 0-2 | -161390 |
| top | average opponent: 1483record: 2-4 | new rating: 1390 | ||
| Grand Prix Chiba 2016 (legacy) | starting rating: 1470 | |||
| round | table | opponent (rating) | result | Δrating |
| 1legacy | 711 | Satou, Wataru5883 (1500) | Lost 0-2 | -181452 |
| 2legacy | 581 | Kagami, Gen (1500) | Lost 0-2 | -171435 |
| 3legacy | 1104 | Bin Sawal, Mohammed Nasir (1414) | Won 2-0 | +181453 |
| 4legacy | 990 | Hilmi, Muhammad (1509) | Won 2-0 | +191472 |
| 5legacy | 578 | Zhou, Lei (1507) | Draw 1-1 | 01472 |
| 6legacy | 740 | Seki, Kazuya (1480) | Draw 1-1 | +11473 |
| 7legacy | 858 | Imai, Tomoyuki (1505) | Lost 0-2 | -181455 |
| 8legacy | 828 | Takano, Ryouta (1467) | Lost 0-2 | -181437 |
| 9legacy | 749 | Nakai, Kousei (1463) | Lost 0-2 | -171420 |
| top | average opponent: 1483record: 2-5-2 | new rating: 1420 | ||
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 1026 | Minamizuka, Yuusuke (1514) | Won 1-0 | +191483 |
| 2sealed | 1053 | Yap, Eugene (1599) | Lost 0-2 | -161467 |
| 3sealed | 1232 | Katakai, Masaki (1519) | Won 2-0 | +191486 |
| 4sealed | 1093 | Moriyasu, Genki (1588) | Lost 0-2 | -161470 |
| top | average opponent: 1555record: 2-2 | new rating: 1470 | ||
| Grand Prix Shizuoka 2015 (KTK limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 768 | Toda, Yuhi (1500) | Won 2-1 | +181518 |
| 2sealed | 693 | Shibuya, Yuji (1518) | Lost 0-2 | -181500 |
| 3sealed | 962 | Osa, Tomoki (1518) | Lost 0-2 | -181482 |
| 4sealed | 1050 | Jackel, Stephen (1462) | Lost 0-2 | -181464 |
| top | average opponent: 1499record: 1-3 | new rating: 1464 | ||