Yamasaki, Sadaharu
Current rating: 1247
Record: 42-69-10
Grand Prix Hiroshima 2001Grand Prix Kobe 2001Grand Prix Shizuoka 2003Grand Prix Nagoya 2004Grand Prix Kitakyushu 2005Grand Prix Hiroshima 2006Grand Prix Kyoto 2007Grand Prix Kitakyushu 2007Grand Prix Kobe 2008Grand Prix Kobe 2009Grand Prix Kitakyushu 2009Grand Prix Yokohama 2010Grand Prix Hiroshima 2011Grand Prix Yokohama 2012Grand Prix Kobe 2017
| Grand Prix Kobe 2017 (modern) | starting rating: 1267 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 479 | Nagoya, Ryouta (1489) | Won 2-1 | +221289 |
| 2modern | 116 | Takahashi, Osamu (1560) | Lost 0-2 | -131276 |
| 3modern | 1083 | Uchida, Seiya (1568) | Lost 0-2 | -131263 |
| 4modern | 1076 | Ishii, Shinji (1432) | Lost 1-2 | -151248 |
| 5modern | 1196 | Nishiguchi, Yoshinori (1463) | Won 2-1 | +221270 |
| 6modern | 1079 | Choi, Joseph (1416) | Won 2-0 | +211291 |
| 7modern | 889 | Hashimoto, Kensuke (1500) | Lost 1-2 | -151276 |
| 8modern | 791 | Kobe, Shohei (1480) | Lost 0-2 | -141262 |
| 9modern | 759 | Fukushima, Masanori (1438) | Lost 0-2 | -151247 |
| top | average opponent: 1483record: 3-6 | new rating: 1247 | ||
| Grand Prix Yokohama 2012 (modern) | starting rating: 1257 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 276 | Hisaki, Yuu (1358) | Lost 0-2 | -161241 |
| 2modern | 620 | Yamauchi, Shotaro (1426) | Lost 0-2 | -151226 |
| 3modern | 638 | Watahiki, Satoru (1466) | Lost 0-2 | -141212 |
| 4modern | 689 | Yamakawa, Naoya (1377) | Draw 1-1 | +31215 |
| 5modern | 648 | Nakajima, Atsushi (1464) | Draw 0-0 | +51220 |
| 6modern | 580 | Nishimoto, Kouhei (1457) | Draw 1-1 | +41224 |
| 7modern | 478 | Kobayashi, Hidetoshi (1429) | Won 2-0 | +221246 |
| 8modern | 371 | Igarashi, Ryuta (1439) | Won 2-1 | +211267 |
| top | average opponent: 1427record: 2-3-3 | new rating: 1267 | ||
| Grand Prix Hiroshima 2011 (ISD standard) | starting rating: 1300 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 95 | Yamano, Tatsuto (1362) | Won 2-1 | +191319 |
| 2standard | 178 | Shimada, Hiroya (1623) | Lost 1-2 | -121307 |
| 3standard | 222 | Watanabe, Shinji (1529) | Lost 0-2 | -141293 |
| 4standard | 346 | Yamamoto, Kazuhide (1505) | Won 2-0 | +221315 |
| 5standard | 195 | Amayasu, Kazunori (1451) | Lost 0-2 | -161299 |
| 6standard | 252 | Shibuya, Takuma (1628) | Lost 0-2 | -121287 |
| 7standard | 236 | Ken S., (1448) | Lost 0-2 | -151272 |
| 8standard | 205 | Tsubokura, Hirotada (1441) | Lost 0-2 | -151257 |
| top | average opponent: 1498record: 2-6 | new rating: 1257 | ||
| Grand Prix Yokohama 2010 (extended) | starting rating: 1327 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 237 | Uehara, Akito (1500) | Won 2-1 | +211348 |
| 2extended | 164 | Nakamura, Takatoshi (1561) | Lost 0-2 | -141334 |
| 3extended | 322 | Miyazaki, Kazuyuki (1276) | Won 2-0 | +171351 |
| 4extended | 226 | Hashimoto, Yuu (1690) | Lost 1-2 | -121339 |
| 5extended | 310 | Okamoto, Jin (1894) | Lost 1-2 | -91330 |
| 6extended | 309 | Toochika, Takayuki (1517) | Lost 1-2 | -141316 |
| 7extended | 268 | Ishihara, Akiho (1466) | Lost 1-2 | -161300 |
| top | average opponent: 1558record: 2-5 | new rating: 1300 | ||
| Grand Prix Kitakyushu 2009 (ZEN limited) | starting rating: 1389 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 11 | Nagata, Satoshi (1424) | Won 2-1 | +191408 |
| 2sealed | 1 | Shimada, Hiroya (1613) | Lost 0-2 | -151393 |
| 3sealed | 156 | imamata, shouta (1500) | Won 2-0 | +201413 |
| 4sealed | 92 | Kobayashi, Masanori (1481) | Lost 1-2 | -161397 |
| 5sealed | 143 | Furutate, Mikihiko (1465) | Lost 1-2 | -171380 |
| 6sealed | 163 | Takeuchi, Hidehito (1248) | Lost 1-2 | -211359 |
| 7sealed | 129 | Ashikari, Yuuki (1467) | Lost 0-2 | -161343 |
| 8sealed | 109 | Lemmon, Andrew (1442) | Lost 0-2 | -161327 |
| top | average opponent: 1455record: 2-6 | new rating: 1327 | ||
| Grand Prix Kobe 2009 (extended) | starting rating: 1390 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 27 | Hibino, Yasutaka (1500) | Lost 1-2 | -161374 |
| 2extended | 157 | Hatta, Tetsuya (1456) | Draw 1-1 | +11375 |
| 3extended | 200 | Matsumoto, Yoshifumi (1466) | Lost 0-2 | -161359 |
| 4extended | 249 | Asakawa, Takahiro (1459) | Won 2-0 | +201379 |
| 5extended | 214 | Iwasaki, Akira (1473) | Lost 0-2 | -161363 |
| 6extended | 196 | Aoki, Kazuya (1651) | Won 1-0 | +231386 |
| 7extended | 16 | Katagiri, Shinichi (1492) | Draw 1-1 | +21388 |
| 8extended | 96 | Mochizuki, Kazuhiro (1469) | Draw 1-1 | +11389 |
| top | average opponent: 1496record: 2-3-3 | new rating: 1389 | ||
| Grand Prix Kobe 2008 (Lorwyn block) | starting rating: 1365 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 223 | Sekine, Kiyotaka (1460) | Won 2-0 | +201385 |
| 2block | 212 | Nagao, Keisuke (1502) | Lost 0-2 | -161369 |
| 3block | 166 | Nakano, Fumiki (1761) | Lost 1-2 | -111358 |
| 4block | 348 | Fujimoto, Takehiro (1538) | Draw 1-1 | +31361 |
| 5block | 301 | Okuda, Koushi (1381) | Won 2-0 | +181379 |
| 6block | 233 | Nasu, Motohiro (1505) | Lost 1-2 | -151364 |
| 7block | 227 | Mori, Shotaro (1541) | Won 2-0 | +211385 |
| 8block | 174 | Suzuki, Yuuji (Chiba (1504) | Won 2-0 | +201405 |
| 9block | 131 | Shiota, Yuuma (1569) | Lost 0-2 | -151390 |
| top | average opponent: 1529record: 4-4-1 | new rating: 1390 | ||
| Grand Prix Kitakyushu 2007 (LRW limited) | starting rating: 1386 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 27 | Uesugi, Fumiya (1500) | Won 2-0 | +201406 |
| 2sealed | 75 | Maeda, Kentaro (1464) | Lost 1-2 | -171389 |
| 3sealed | 116 | Yamada, Ryuichiro (1471) | Lost 0-2 | -161373 |
| 4sealed | 132 | Hamada, Junji (1510) | Lost 1-2 | -161357 |
| 5sealed | 137 | Yamasaki, Ippei (1403) | Lost 0-2 | -171340 |
| 6sealed | 120 | Fukushige, Masanori (1465) | Lost 0-2 | -151325 |
| 7sealed | 15 | Kodama, Hiroshi (1478) | Won 2-1 | +201345 |
| 8sealed | 72 | Rutledge, Seth (1441) | Won 2-0 | +201365 |
| top | average opponent: 1466record: 3-5 | new rating: 1365 | ||
| Grand Prix Kyoto 2007 (PLC standard) | starting rating: 1386 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 269 | Suzuki, Shuusei (1441) | Lost 1-2 | -171369 |
| 2standard | 262 | Takahashi, Tomoki (1482) | Lost 0-2 | -161353 |
| 3standard | 331 | Nishimura, Seiichi (1464) | Won 2-0 | +201373 |
| 4standard | 292 | Ishitaka, Yusuke (1482) | Lost 1-2 | -161357 |
| 5standard | 334 | Satou, Takahisa (1463) | Lost 1-2 | -161341 |
| 6standard | 296 | Sada, Kazutaka (1449) | Won 2-1 | +201361 |
| 7standard | 248 | Kido, Takayoshi (1463) | Lost 0-2 | -161345 |
| 8standard | 208 | Take, Toshiharu (1562) | Won 2-0 | +221367 |
| 9standard | 160 | Ikeda, Tomokazu (1464) | Won 2-1 | +191386 |
| top | average opponent: 1474record: 4-5 | new rating: 1386 | ||
| Grand Prix Hiroshima 2006 (CSP limited) | starting rating: 1417 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 58 | Tsuta, Naoto (1500) | Lost 0-2 | -171400 |
| 2sealed | 162 | Mino, Tetsuya (1454) | Lost 0-2 | -171383 |
| 3sealed | 154 | Watanabe, Tomosumi (1430) | Won 2-0 | +191402 |
| 4sealed | 154 | Murata, Shouta (1563) | Lost 0-2 | -151387 |
| 5sealed | 144 | Kuraoka, Shintarou (1428) | Draw 1-1 | +11388 |
| 6sealed | 130 | Yamada, Shunsuke (1361) | Lost 1-2 | -191369 |
| 7sealed | 56 | Onta, Hirofumi (1302) | Won 2-0 | +171386 |
| top | average opponent: 1434record: 2-4-1 | new rating: 1386 | ||
| Grand Prix Kitakyushu 2005 (extended) | starting rating: 1384 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 21 | Kake, Kenzou (1500) | Won 2-1 | +201404 |
| 2extended | 14 | Shirouzono, Kenshi (1463) | Lost 0-2 | -171387 |
| 3extended | 87 | Sogabe, Ippei (1635) | Lost 0-2 | -131374 |
| 4extended | 107 | Shibuya, Kouichi (1453) | Won 2-0 | +191393 |
| 5extended | 98 | Harada, Toshiyuki (1490) | Lost 0-2 | -161377 |
| 6extended | 99 | Nakamura, Kenji (1496) | Won 2-0 | +201397 |
| 7extended | 74 | Iwahashi, Yuuki (1482) | Won 2-1 | +201417 |
| top | average opponent: 1503record: 4-3 | new rating: 1417 | ||
| Grand Prix Nagoya 2004 (5DN standard) | starting rating: 1467 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 68 | Fujita, Kouki (1500) | Won 2-0 | +191486 |
| 2standard | 198 | Imagawa, Hiromasa (1528) | Lost 1-2 | -171469 |
| 3standard | 242 | Shinozaki, Yuu (1582) | Lost 0-2 | -161453 |
| 4standard | 378 | Shimada, Atsuki (1482) | Lost 0-2 | -181435 |
| 5standard | 365 | Tatsuhara, Satoshi (1516) | Lost 0-2 | -161419 |
| 6standard | 350 | Ohtsu, Yuya (1446) | Lost 0-2 | -181401 |
| 7standard | 299 | Tsuno, Fuminori (1401) | Lost 0-2 | -181383 |
| 8standard | 250 | Miura, Shigehiro (1357) | Lost 1-2 | -181365 |
| 9standard | 209 | Nisigahana, Tatunori (1427) | Won 2-0 | +191384 |
| top | average opponent: 1471record: 2-7 | new rating: 1384 | ||
| Grand Prix Shizuoka 2003 (MRD limited) | starting rating: 1465 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 107 | Fujimoto, Takehiro (1503) | Lost 1-2 | -171448 |
| 2sealed | 229 | Kimoto, Seiichi (1479) | Draw 1-1 | +11449 |
| 3sealed | 247 | Kim, Chun-Ho (1482) | Won 2-0 | +181467 |
| 4sealed | 192 | Nakajima, Mikihito (1499) | Draw 1-1 | +11468 |
| 5sealed | 205 | Kim, Young-jun (1499) | Lost 0-2 | -181450 |
| 6sealed | 187 | Kobayashi, Hajime (1338) | Won 2-0 | +161466 |
| 7sealed | 139 | Mizuno, Hirohiko (1500) | Lost 0-2 | -171449 |
| 8sealed | 123 | Fukai, Koichi (1471) | Won 2-0 | +181467 |
| top | average opponent: 1471record: 3-3-2 | new rating: 1467 | ||
| Grand Prix Kobe 2001 (Invasion block) | starting rating: 1481 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 193 | Ikushima, Koichi (1500) | Won 2-0 | +181499 |
| 2block | 281 | Kamioka, Masayuki (1519) | Won 2-0 | +191518 |
| 3block | 184 | Hojo, Naomasa (1563) | Lost 0-2 | -181500 |
| 4block | 319 | Maruyama, Satoshi (1535) | Won 2-0 | +191519 |
| 5block | 186 | Lee, Kil-Ho (1483) | Won 2-1 | +171536 |
| 6block | 133 | Kobayashi, Hideki (1607) | Lost 0-2 | -161520 |
| 7block | 246 | Sato, Daisuke (Tokyo) (1537) | Lost 0-2 | -181502 |
| 8block | 189 | Suga, Takeichi (1458) | Lost 0-2 | -191483 |
| 9block | 204 | Okazaki, Shinya (1500) | Lost 0-2 | -181465 |
| top | average opponent: 1522record: 4-5 | new rating: 1465 | ||
| Grand Prix Hiroshima 2001 (INV limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 179 | Iwahashi, Yuuki (1500) | Won 2-0 | +181518 |
| 2sealed | 103 | Ikematsu, Tsuyoshi (1518) | Lost 0-2 | -181500 |
| 3sealed | 135 | Shimizu, Hajime (1466) | Lost 1-2 | -191481 |
| 4sealed | 158 | Wakabayashi, Kiyoshi (1466) | Lost 1-2 | -181463 |
| 5sealed | 156 | Tani, Tokuo (1464) | Won 2-1 | +181481 |
| 6sealed | 140 | Noguchi, Masami (1463) | Lost 1-2 | -181463 |
| 7sealed | 115 | Ishibashi, Akitomo (1465) | Won 2-0 | +181481 |
| top | average opponent: 1477record: 3-4 | new rating: 1481 | ||