Tamaru, Masashi
Current rating: 1326
Record: 17-32-1
| MagicCon Barcelona 2023 Limited Open (LTR limited) | starting rating: 1348 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 3120 | Kocsis, Gabor (1698) | Lost 0-2 | -121336 |
| 2sealed | 3151 | Rosdahl, Alexander (1776) | Lost 0-2 | -101326 |
| top | average opponent: 1737record: 0-2 | new rating: 1326 | ||
| Grand Prix Chiba 2019 (M20 limited) | starting rating: 1287 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 42 | Masayuki, Nishida (1500) | Won 2-0 | +221309 |
| 2sealed | 250 | Katayama, Satoru (1432) | Won 2-0 | +201329 |
| 3sealed | 551 | Kanekiyo, Ryusuke (1319) | Lost 1-2 | -181311 |
| 4sealed | 478 | Kawashima, Kenta (1534) | Won 2-1 | +221333 |
| 5sealed | 376 | Kusakawa, Naoto (1423) | Won 2-1 | +191352 |
| 6sealed | 229 | Togashi, Rikiya (1562) | Won 2-1 | +221374 |
| 7sealed | 94 | Hiroi, Genki (1700) | Lost 0-2 | -121362 |
| 8sealed | 194 | Matsumura, Hideaki (1605) | Lost 0-2 | -141348 |
| top | average opponent: 1509record: 5-3 | new rating: 1348 | ||
| Grand Prix Yokohama 2019 (modern) | starting rating: 1326 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 730 | Bessho, Yuya (1640) | Lost 0-2 | -121314 |
| 2modern | 811 | Ishihara, Ryo (1483) | Won 2-0 | +211335 |
| 3modern | 786 | Kawasaki, Yuta (1464) | Lost 1-2 | -161319 |
| 4modern | 992 | Yamaguchi, Satoshi 1114 (1578) | Lost 0-2 | -131306 |
| 5modern | 963 | Itou, Kuninosuke (1253) | Lost 0-2 | -191287 |
| top | average opponent: 1483record: 1-4 | new rating: 1287 | ||
| Grand Prix Yokohama 2013 (GTC limited) | starting rating: 1347 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 54 | Yoshida, Toshiaki (1483) | Won 2-0 | +211368 |
| 2sealed | 252 | Tanaka, Takanori (1465) | Lost 1-2 | -161352 |
| 3sealed | 210 | Takashima, Hiroto (1482) | Lost 1-2 | -161336 |
| 4sealed | 461 | Shimoyama, Youhei (1482) | Won 2-1 | +211357 |
| 5sealed | 279 | Morikawa, Yuuta (1519) | Lost 1-2 | -151342 |
| 6sealed | 304 | Kinebuchi, Shouta (1481) | Lost 0-2 | -161326 |
| top | average opponent: 1485record: 2-4 | new rating: 1326 | ||
| Grand Prix Yokohama 2012 (modern) | starting rating: 1399 | |||
| round | table | opponent (rating) | result | Δrating |
| 1modern | 199 | Ogawa, Tomonari (1427) | Lost 1-2 | -171382 |
| 2modern | 471 | Yoshizawa, Toshio (1264) | Won 2-0 | +161398 |
| 3modern | 552 | Nam, Kyung Hwan (1415) | Lost 1-2 | -181380 |
| 4modern | 526 | Uemura, Naoki (1484) | Lost 0-2 | -161364 |
| 5modern | 624 | Nasu, Hideki H (1461) | Lost 0-2 | -171347 |
| top | average opponent: 1410record: 1-4 | new rating: 1347 | ||
| Grand Prix Yokohama 2010 (extended) | starting rating: 1429 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 235 | Fujii, Masahiro (1485) | Lost 0-2 | -171412 |
| 2extended | 445 | Shimizu, Ryo (1478) | Won 2-0 | +191431 |
| 3extended | 165 | Asano, Atsushi (1507) | Lost 0-2 | -171414 |
| 4extended | 402 | Yoda, Kazuya (1578) | Lost 0-2 | -151399 |
| top | average opponent: 1512record: 1-3 | new rating: 1399 | ||
| Grand Prix Kobe 2009 (extended) | starting rating: 1439 | |||
| round | table | opponent (rating) | result | Δrating |
| 1extended | 101 | Sasaki, Yuuta (1500) | Lost 0-2 | -171422 |
| 3extended | 140 | Takeda, Kazuki (1622) | Won 2-1 | +221444 |
| 4extended | 144 | Hirota, Ginjiro (1484) | Won 2-1 | +191463 |
| 5extended | 67 | Tanaka, Eiji (1452) | Lost 0-2 | -181445 |
| 6extended | 123 | Kaga, Hiroyuki (1554) | Lost 1-2 | -161429 |
| top | average opponent: 1522record: 2-3 | new rating: 1429 | ||
| Grand Prix Kobe 2008 (Lorwyn block) | starting rating: 1429 | |||
| round | table | opponent (rating) | result | Δrating |
| 1block | 123 | Omonishi, Kojiro (1482) | Lost 1-2 | -171412 |
| 2block | 240 | Koizumi, Hirotoshi (1463) | Won 2-0 | +191431 |
| 3block | 162 | Nakano, Hiroaki (1539) | Won 2-1 | +201451 |
| 4block | 150 | Sadahiro, Masashi (1504) | Won 2-1 | +191470 |
| 5block | 108 | Hayashi, Hiroki (1659) | Lost 0-2 | -151455 |
| 6block | 169 | Matsumoto, Masataka (1569) | Lost 0-2 | -161439 |
| top | average opponent: 1536record: 3-3 | new rating: 1439 | ||
| Grand Prix Shizuoka 2008 (MOR standard) | starting rating: 1464 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 104 | Sekizawa, Takayuki (1449) | Lost 0-2 | -191445 |
| 2standard | 305 | Higashimura, Kazuya (1457) | Won 2-1 | +181463 |
| 3standard | 240 | Shiota, Yuuma (1547) | Lost 1-2 | -161447 |
| 4standard | 280 | Yamamoto, Muneyuki (1451) | Lost 0-2 | -181429 |
| top | average opponent: 1476record: 1-3 | new rating: 1429 | ||
| Grand Prix Kyoto 2007 (PLC standard) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1standard | 70 | Kohigashi, Ryosuke (1446) | Won 2-1 | +171517 |
| 2standard | 162 | Takeda, Takamichi (1594) | Lost 0-2 | -171500 |
| 3standard | 188 | Shimomura, Tetsuya (1500) | Lost 1-2 | -181482 |
| 4standard | 321 | Yachi, Hajime (1434) | Draw 1-1 | 01482 |
| 5standard | 308 | Nakamura, Yuu (1481) | Lost 1-2 | -181464 |
| top | average opponent: 1491record: 1-3-1 | new rating: 1464 | ||