Ishii, Masashi
Current rating: 1461
Record: 53-64-9
Grand Prix Shizuoka 2001Grand Prix Shizuoka 2003Grand Prix Yokohama 2004Grand Prix Yokohama 2012Grand Prix Yokohama 2013Grand Prix Shizuoka 2013Grand Prix Nagoya 2014Grand Prix Shizuoka 2015Grand Prix Chiba 2015Grand Prix Tokyo 2016Grand Prix Shizuoka 2017Grand Prix Chiba 2018Grand Prix Shizuoka 2018 (standard)Grand Prix Kyoto 2019Grand Prix Chiba 2019
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1490 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 398 | Hata, Tomonori0099 (1416) | Won 2-1 | +171507 |
| 2sealed | 129 | Nakagawa, Yuki (1549) | Lost 0-2 | -171490 |
| 3sealed | 647 | Kawano, Junichi (1652) | Lost 0-2 | -151475 |
| 4sealed | 892 | Hashimoto, Arata (1599) | Won 2-1 | +201495 |
| 5sealed | 636 | Saito, Taira (1508) | Lost 0-2 | -181477 |
| 6sealed | 692 | Enomoto, Yasumasa (1456) | Lost 0-2 | -181459 |
| 7sealed | 651 | Obata, Ken (1522) | Lost 0-2 | -171442 |
| 8sealed | 540 | Mitani, Kazuki (1483) | Won 2-0 | +191461 |
| top | average opponent: 1523record: 3-5 | new rating: 1461 | ||
| Grand Prix Kyoto 2019 (RNA standard) | starting rating: 1470 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 307 | Terai, Yusuke (1497) | Draw 1-1 | 01470 |
| 2standard | 502 | Kaiho, Yuta (1502) | Won 2-0 | +191489 |
| 3standard | 493 | Hashimoto, Ryota (1518) | Lost 1-2 | -181471 |
| 4standard | 689 | Ito, Ryo (1348) | Won 2-0 | +161487 |
| 5standard | 473 | Kondou, Ryuuki (1523) | Won 2-0 | +191506 |
| 6standard | 294 | Tsuzuki, Makoto (1530) | Won 2-0 | +181524 |
| 7standard | 182 | Choi, Kiho (1641) | Lost 0-2 | -161508 |
| 8standard | 319 | Zhu, Jia Nan (1519) | Lost 0-2 | -181490 |
| top | average opponent: 1510record: 4-3-1 | new rating: 1490 | ||
| Grand Prix Shizuoka 2018 (standard) (GRN standard) | starting rating: 1489 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 624 | Kawano, Airi (1500) | Lost 0-2 | -181471 |
| 2standard | 879 | Iwatou, Kodai (1407) | Lost 0-2 | -191452 |
| 3standard | 1031 | Yonaha, Syoryu (1463) | Won 2-0 | +181470 |
| 4standard | 1026 | Kimura, Daichi (1446) | Won 2-1 | +171487 |
| 5standard | 752 | Zaizen, Kengo (1498) | Lost 0-2 | -171470 |
| top | average opponent: 1463record: 2-3 | new rating: 1470 | ||
| Grand Prix Chiba 2018 (M19 limited) | starting rating: 1357 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 602 | Iwabuchi, Tomohiro (1500) | Won 2-1 | +201377 |
| 2sealed | 70 | Chao, Xiang (1522) | Won 2-0 | +211398 |
| 3sealed | 514 | Kai, Masatoshi (1416) | Won 2-0 | +181416 |
| 4sealed | 42 | Wada, Hiroya (1687) | Lost 0-2 | -131403 |
| 5sealed | 449 | Ishida, Shoichi (1417) | Won 2-0 | +181421 |
| 6sealed | 230 | Furusawa, Reona (1475) | Lost 1-2 | -171404 |
| 7sealed | 286 | Tamaki, Junnosuke (1663) | Won 2-0 | +231427 |
| 8sealed | 216 | Hisano, Mikita (1437) | Won 2-0 | +181445 |
| 9sealed | 154 | Tamada, Ryoichi (1997) | Lost 1-2 | -91436 |
| 10draft | 720 | Iino, Ryuji (1591) | Won 2-1 | +211457 |
| 11draft | 715 | Taira, Kentaro (1577) | Lost 0-2 | -161441 |
| 12draft | 682 | Masuyama, Takahiro (1537) | Won 2-1 | +201461 |
| 13draft | 630 | Kubo, Hirotaka (1608) | Lost 0-2 | -151446 |
| 14draft | 616 | Kokubun, Takeshi (1748) | Won 2-0 | +231469 |
| 15draft | 615 | Hu, Eric [CHN] (1551) | Won 2-1 | +201489 |
| top | average opponent: 1582record: 10-5 | new rating: 1489 | ||
| Grand Prix Shizuoka 2017 (AER standard) | starting rating: 1372 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 153 | Tamura, Hajime (1549) | Won 2-1 | +211393 |
| 2standard | 31 | Narita, Takashi (1519) | Won 2-0 | +201413 |
| 3standard | 448 | Muraoka, Hideaki (1468) | Won 2-1 | +191432 |
| 4standard | 79 | Hirouchi, Hideaki (1526) | Lost 0-2 | -161416 |
| 5standard | 533 | Oikawa, Takaaki (1535) | Won 2-1 | +201436 |
| 6standard | 361 | Sugimoto, Renn (1541) | Won 2-1 | +201456 |
| 7standard | 150 | Nishikawa, Haruyoshi (1524) | Lost 0-2 | -171439 |
| 8standard | 413 | Mori, Yumeto (1580) | Lost 1-2 | -151424 |
| 9standard | 581 | Ogawa, Nobuharu (1502) | Won 2-0 | +191443 |
| 10standard | 409 | Shiba, Yoshimasa (1536) | Lost 0-2 | -161427 |
| 11standard | 391 | Nakamura, Taro (1408) | Draw 1-1 | -11426 |
| 12standard | 343 | Tsuruoka, Shouta (1598) | Lost 0-2 | -151411 |
| 13standard | 333 | Yamashita, Kohji (1186) | Lost 0-2 | -221389 |
| 14standard | 313 | Kato, Jun (1524) | Lost 1-2 | -151374 |
| 15standard | 296 | Kashiwagi, Yuki (1426) | Lost 0-2 | -171357 |
| top | average opponent: 1495record: 6-8-1 | new rating: 1357 | ||
| Grand Prix Tokyo 2016 (SOI standard) | starting rating: 1416 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 1007 | Tomita, Kei (1613) | Lost 1-2 | -141402 |
| 2standard | 1076 | Katakai, Masaki (1523) | Lost 1-2 | -161386 |
| 3standard | 1484 | Obata, Ken (1462) | Won 2-1 | +191405 |
| 4standard | 1333 | Touma, Hiroshi (1443) | Won 2-0 | +191424 |
| 5standard | 905 | Shibata, Takahiro (1413) | Lost 0-2 | -181406 |
| 6standard | 1101 | Susumu, Numata (1482) | Lost 1-2 | -171389 |
| 7standard | 1179 | Noda, Yuuichirou (1402) | Lost 0-2 | -171372 |
| top | average opponent: 1477record: 2-5 | new rating: 1372 | ||
| Grand Prix Chiba 2015 (MM2 limited) | starting rating: 1469 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 34 | Kajimura, Shintaro (1500) | Won 2-0 | +181487 |
| 2sealed | 263 | Nakano, Ryo (1482) | Lost 0-2 | -181469 |
| 3sealed | 291 | Daikai, Rikiya (1530) | Lost 1-2 | -171452 |
| 4sealed | 506 | Fukuda, Tatsuhiro (1480) | Lost 0-2 | -171435 |
| 5sealed | 448 | Togawa, Tanichirou (1402) | Lost 1-2 | -191416 |
| top | average opponent: 1479record: 1-4 | new rating: 1416 | ||
| Grand Prix Shizuoka 2015 (KTK limited) | starting rating: 1425 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 194 | Sone, Shuhei (1482) | Draw 1-1 | +11426 |
| 2sealed | 256 | Koretomo, Yuji (1460) | Draw 1-1 | +11427 |
| 3sealed | 442 | Ishizuka, Akihito (1480) | Draw 1-1 | 01427 |
| 4sealed | 388 | Takawashi, Shun'Ichi (1479) | Won 2-1 | +191446 |
| 5sealed | 339 | Shigezumi, Manabu (1440) | Won 2-1 | +181464 |
| 6sealed | 269 | Kamada, Chihiro (1483) | Lost 1-2 | -171447 |
| 7sealed | 267 | Koide, Yuichi (1503) | Won 2-0 | +191466 |
| 8sealed | 163 | Miura, Naoyasu (1525) | Lost 0-2 | -171449 |
| 9sealed | 178 | Chijimi, Keiichi (1564) | Won 2-1 | +201469 |
| top | average opponent: 1491record: 4-2-3 | new rating: 1469 | ||
| Grand Prix Nagoya 2014 (BNG limited) | starting rating: 1428 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 768 | Kosaka, Ryohei (1516) | Draw 1-1 | +11429 |
| 2sealed | 719 | Saitou, Keiichirou (1660) | Lost 0-2 | -141415 |
| 3sealed | 860 | Isa, Yukifumi (1486) | Won 2-0 | +201435 |
| 4sealed | 780 | Kawada, Yuta (1519) | Lost 1-2 | -171418 |
| 5sealed | 821 | Ochi, Takushi (1523) | Won 2-0 | +201438 |
| 6sealed | 754 | Honma, Rie (1491) | Lost 1-2 | -171421 |
| 7sealed | 747 | Ookubo, Yoshirou (1480) | Won 1-0 | +191440 |
| 8sealed | 685 | Sasaki, Hideto (1518) | Lost 1-2 | -171423 |
| 9sealed | 670 | Smithberger, John (1499) | Draw 0-0 | +21425 |
| top | average opponent: 1521record: 3-4-2 | new rating: 1425 | ||
| Grand Prix Shizuoka 2013 (THS standard) | starting rating: 1419 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 238 | Korekawa, Takashi (1486) | Lost 1-2 | -161403 |
| 2standard | 251 | Takahashi, Hirotomo (1482) | Won 2-0 | +191422 |
| 3standard | 322 | Kusumi, Kousei (1303) | Won 2-0 | +161438 |
| 4standard | 215 | Kashiwagi, Souta (1533) | Lost 0-2 | -161422 |
| 5standard | 274 | Takano, Yuuki (1493) | Lost 0-2 | -171405 |
| 6standard | 294 | Kuwahara, Yoshiki (1532) | Won 2-0 | +201425 |
| 7standard | 203 | Kawamura, Naoki (1487) | Draw 1-1 | +11426 |
| 8standard | 194 | Imamura, Norihide (1440) | Lost 1-2 | -171409 |
| 9standard | 332 | Revilla, Martin (1457) | Won 1-0 | +191428 |
| top | average opponent: 1468record: 4-4-1 | new rating: 1428 | ||
| Grand Prix Yokohama 2013 (GTC limited) | starting rating: 1385 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 311 | Yokotsuka, Yu (1555) | Lost 0-2 | -151370 |
| 2sealed | 367 | Sekino, Takashi (1483) | Won 2-0 | +201390 |
| 3sealed | 380 | Kubo, Kenta (1500) | Won 2-0 | +201410 |
| 4sealed | 261 | Nojiri, Fumitoshi (1517) | Won 2-0 | +201430 |
| 5sealed | 69 | Kasuga, Ryou (1483) | Lost 0-2 | -171413 |
| 6sealed | 210 | Murata, Shunya (1399) | Lost 0-2 | -191394 |
| 7sealed | 259 | Matsumura, Takehiko (1416) | Won 2-0 | +191413 |
| 8sealed | 300 | Andou, Ryou (1477) | Lost 0-2 | -171396 |
| 9sealed | 328 | Abe, Hirofumi (1706) | Won 2-1 | +231419 |
| top | average opponent: 1504record: 5-4 | new rating: 1419 | ||
| Grand Prix Yokohama 2012 (modern) | starting rating: 1446 | |||
| round | table | opponent (rating) | result | Δrating |
| 2modern | 214 | Kikuchi, Kouhei (1517) | Won 2-0 | +191465 |
| 3modern | 175 | Murata, Toshiaki (1693) | Lost 1-2 | -141451 |
| 4modern | 281 | Ogawa, Tomonari (1447) | Lost 1-2 | -181433 |
| 5modern | 523 | Fujii, Kazuhiro (1502) | Lost 0-2 | -161417 |
| 6modern | 525 | [anonymous] | Lost 0-2 | -181399 |
| 7modern | 451 | Matsuda, Natsuki (1464) | Won 2-1 | +191418 |
| 8modern | 336 | Imai, Kenta (1477) | Lost 0-2 | -171401 |
| 9modern | 292 | Hashimoto, Naoyuki (1462) | Lost 0-2 | -161385 |
| top | average opponent: 1501record: 2-6 | new rating: 1385 | ||
| Grand Prix Yokohama 2004 (COK limited) | starting rating: 1418 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 158 | Takakura, Takeshi (1452) | Won 2-1 | +181436 |
| 2sealed | 111 | Kaneko, Takaoki (1518) | Won 2-0 | +201456 |
| 3sealed | 42 | Lee, Ji-Hoon (1699) | Lost 0-2 | -141442 |
| 4sealed | 173 | Maehata, Yasuhito (1694) | Won 2-0 | +231465 |
| 5sealed | 122 | Suzuki, Gou (1439) | Lost 0-2 | -191446 |
| top | average opponent: 1560record: 3-2 | new rating: 1446 | ||
| Grand Prix Shizuoka 2003 (MRD limited) | starting rating: 1465 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 32 | Mera, Kenichi (1484) | Lost 0-2 | -171448 |
| 2sealed | 273 | Yosizumi, Manabu (1482) | Won 2-0 | +181466 |
| 3sealed | 179 | Nishiwaki, Masato (1433) | Won 2-1 | +181484 |
| 4sealed | 127 | Nagato, Kazuo (1535) | Lost 0-2 | -171467 |
| 5sealed | 184 | Ohtsu, Minami (1502) | Lost 0-2 | -181449 |
| 6sealed | 184 | Mouri, Takemasa (1652) | Lost 0-2 | -141435 |
| 7sealed | 148 | Takada, Ryo (1464) | Lost 0-2 | -181417 |
| 8sealed | 131 | Higuchi, Kumi (1422) | Draw 1-1 | +11418 |
| top | average opponent: 1497record: 2-5-1 | new rating: 1418 | ||
| Grand Prix Shizuoka 2001 (ODY limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 86 | Uesugi, Masatoshi (1500) | Won 2-0 | +181518 |
| 2sealed | 168 | Yamada, Tsutomu (1543) | Lost 1-2 | -181500 |
| 3sealed | 203 | Hayashi, Hirokazu (1500) | Lost 0-2 | -181482 |
| 4sealed | 219 | Ikenoya, Atsushi (1482) | Won 2-0 | +181500 |
| 5sealed | 224 | Murata, Kouji (1549) | Lost 0-2 | -171483 |
| 6sealed | 202 | Tsuruta, Tomoo (1484) | Lost 1-2 | -181465 |
| top | average opponent: 1510record: 2-4 | new rating: 1465 | ||