Maruyama, Koji
Current rating: 1541
Record: 36-32-1
| Grand Prix Nagoya 2019 (ELD standard) | starting rating: 1590 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 202 | Saito, Ryo 3421 (1463) | Lost 0-2 | -201570 |
| 2standard | 467 | Yamazaki, Takayoshi (1396) | Won 2-0 | +151585 |
| 3standard | 627 | Yokotani, Junpei (1506) | Lost 0-2 | -201565 |
| 4standard | 747 | Furukawa, Takehito (1315) | Won 2-1 | +141579 |
| 5standard | 639 | Ookura, Haruka (1698) | Lost 1-2 | -161563 |
| 6standard | 618 | Suzuki, Tomohiro (1539) | Lost 0-2 | -181545 |
| 7standard | 586 | Takayama, Junichi (1488) | Won 2-1 | +171562 |
| 8standard | 477 | Nakagawa, Hiroki (1400) | Lost 1-2 | -211541 |
| top | average opponent: 1476record: 3-5 | new rating: 1541 | ||
| Grand Prix Bangkok 2019 (ELD limited) | starting rating: 1606 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 201 | Kuptanond, Warabhat (1500) | Lost 1-2 | -201586 |
| 2sealed | 236 | Jarernrajsamee, Patthakorn (1457) | Won 2-0 | +151601 |
| 3sealed | 267 | Ng, Chai (1535) | Lost 1-2 | -191582 |
| 4sealed | 330 | Suryadhi, Ebnu (1504) | Won 2-1 | +171599 |
| 5sealed | 280 | Thiamrattananon, Chantawit (1511) | Lost 1-2 | -201579 |
| 6sealed | 269 | Naknakled, Nash (1466) | Won 2-0 | +161595 |
| 7sealed | 187 | Suzuki, Kouichirou (1423) | Lost 0-2 | -211574 |
| 8sealed | 180 | Kaew-Ngarm, Pongsakorn (1479) | Won 2-0 | +161590 |
| top | average opponent: 1485record: 4-4 | new rating: 1590 | ||
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1560 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 524 | Fukuda, Tatsuhiro (1454) | Won 2-0 | +161576 |
| 2sealed | 370 | Kakinoki, Junichi (1623) | Lost 0-2 | -171559 |
| 3sealed | 820 | Sakurai, Wataru (1487) | Won 2-1 | +171576 |
| 4sealed | 652 | Hirose, Yutaka (1287) | Won 2-1 | +121588 |
| 5sealed | 462 | Taneichi, Hisashi (1571) | Won 2-1 | +181606 |
| 6sealed | 210 | Adachi, Takaaki (1670) | Lost 1-2 | -171589 |
| 7sealed | 476 | Kamada, Yuuki (1562) | Draw 1-1 | 01589 |
| 8sealed | 351 | Motoyanagi, Youhei (1527) | Won 2-1 | +171606 |
| top | average opponent: 1523record: 5-2-1 | new rating: 1606 | ||
| Grand Prix Kuala Lumpur 2016 (KLD standard) | starting rating: 1660 | |||
| round | table | opponent (rating) | result | Δrating |
| 3standard | 50 | Sorakup, Aekarash (1795) | Lost 0-0 | -161644 |
| 4standard | 634 | DeLa Pena, Jefferson (1511) | Lost 0-2 | -201624 |
| 5standard | 196 | Chanpleng, Sethsilp (1645) | Lost 1-2 | -181606 |
| 6standard | 271 | Wong, Andrew (1441) | Lost 0-2 | -211585 |
| 7standard | 267 | Iskandar Pino, Moazan Emran (1424) | Won 2-0 | +151600 |
| 8standard | 225 | Magcamit, Benjamin (1567) | Lost 1-2 | -181582 |
| 9standard | 230 | Yasui, Yusuke (1372) | Lost 1-2 | -221560 |
| top | average opponent: 1536record: 1-6 | new rating: 1560 | ||
| Grand Prix Taipei 2016 (SOI standard) | starting rating: 1619 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 7 | Jan, Hung Sheng (1500) | Won 2-1 | +161635 |
| 2standard | 114 | Li, Chi (1601) | Lost 1-2 | -191616 |
| 3standard | 307 | Yamaguchi, Yuji (1516) | Won 2-0 | +161632 |
| 4standard | 251 | Yoshino, Kohei (1446) | Won 2-1 | +151647 |
| 5standard | 177 | Moriyasu, Genki (1714) | Won 2-1 | +191666 |
| 6standard | 85 | Takesue, Chikara (1778) | Lost 1-2 | -161650 |
| 7standard | 1013 | Kondo, Hirotsugu (1487) | Won 2-0 | +151665 |
| 8standard | 93 | Jinbo, Takashi (1526) | Lost 1-2 | -201645 |
| 9standard | 164 | Ojima, Tomohito (1352) | Won 2-1 | +121657 |
| 10standard | 113 | Young, Ryan (1897) | Won 2-1 | +231680 |
| 11standard | 61 | Murae, Ryuji (1715) | Lost 1-2 | -181662 |
| 12standard | 78 | Liu, Jiayang (1611) | Lost 1-2 | -191643 |
| 13standard | 99 | Sato, Hisao (1577) | Won 2-0 | +171660 |
| 14standard | 80 | Hsu, Shuo-En (1715) | Lost 0-2 | -171643 |
| 15standard | 84 | Furuichi, Takenori (1570) | Won 2-0 | +171660 |
| top | average opponent: 1600record: 9-6 | new rating: 1660 | ||
| Grand Prix Tokyo 2016 (SOI standard) | starting rating: 1501 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 651 | Ueyama, Yuji (1478) | Won 2-0 | +171518 |
| 2standard | 526 | Katou, Youdai (1521) | Won 2-0 | +181536 |
| 3standard | 350 | Tsubota, Hokuto (1537) | Won 2-0 | +181554 |
| 4standard | 208 | Tamada, Ryoichi (1944) | Won 2-0 | +251579 |
| 5standard | 6 | Masuno, Ryosuke (1747) | Won 2-0 | +211600 |
| 6standard | 58 | Kono, Toru (1561) | Won 2-1 | +171617 |
| 7standard | 23 | Kobayashi, Hiroya (1611) | Won 2-0 | +181635 |
| 8standard | 15 | Shiota, Fumihiko (1848) | Won 2-0 | +221657 |
| 9standard | 4 | Huang, Hao-Shan (2024) | Won 2-0 | +251682 |
| 10standard | 5 | Boku, Takashi (1711) | Lost 0-2 | -181664 |
| 11standard | 22 | Horikoshi, Takayuki (1771) | Lost 1-2 | -161648 |
| 12standard | 53 | Yasooka, Shota (2096) | Lost 0-2 | -101638 |
| 13standard | 120 | Son, Kii (1641) | Lost 0-2 | -181620 |
| 14standard | 167 | Matsuda, Yukio (1568) | Won 2-0 | +171637 |
| 15standard | 82 | Miyagi, Moto (1630) | Lost 0-2 | -181619 |
| top | average opponent: 1712record: 10-5 | new rating: 1619 | ||
| Grand Prix Sendai 2004 (DST limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 87 | Maeda, Yuuto (1488) | Lost 1-2 | -181482 |
| 2sealed | 163 | Matsumoto, Yuki1423 (1482) | Won 2-1 | +181500 |
| 3sealed | 145 | Yamaguchi, Naohiro (1483) | Won 2-0 | +171517 |
| 4sealed | 113 | Murakami, Ken (1506) | Lost 0-2 | -181499 |
| 5sealed | 178 | Kayama, Akira (1506) | Lost 1-2 | -181481 |
| 6sealed | 152 | Aihara, Yoshiteru (1483) | Won 1-0 | +181499 |
| 7sealed | 130 | Komada, Norihiko (1501) | Won 2-0 | +181517 |
| 8sealed | 85 | Higono, Naoki (1591) | Lost 0-2 | -161501 |
| top | average opponent: 1505record: 4-4 | new rating: 1501 | ||