Go Player Ratings

JAAbout ratings

Iwamaru Taira

Iwamaru Taira (岩丸平) has a rating of 1704, ranked 133 of 452 in professional play. Their highest rating so far is 1749 (September 20, 2021).

Iwamaru Taira7 dan岩丸平Nihon Ki-in Kansai HQ
Rating1704
Rank133
1-year change↑81
Peak rating1749
Last 10249-195
2026 record
15-6
Record since 1927
249-195
Win rate
.561

The rating is calculated from published game results. It does not include any adjustment for playing Black.

Professional ratingsFind a player

Rating history — professional

24 gamesHigh 1710Low 1605
70 gamesHigh 1710Low 1559
126 gamesHigh 1749Low 1559
365 gamesHigh 1749Low 1461

The “All” view starts at 2006; earlier years are used only to warm up the calculation and are not shown.

Recent games

Up to 20 games, newest first. “Change” is the rating movement.
DateOpponent and tournamentResultChange
August 27, 2026Tsuruta KazushiTengen　Colors unknown↓6
August 10, 2026Yamada TakujiSGW Cup Chuyo Preliminary Semifinal　Colors unknown↑17
August 10, 2026Tsuneishi TakashiSGW Cup Chuyo Preliminary Round 1　Colors unknown↑18
July 27, 2026Yamashiro HiroshiHoninbo　Colors unknown↓12
July 16, 2026Nakano HironariTengen　Colors unknown↑19
July 2, 2026Yamada KimioOza　Colors unknown↓10
June 18, 2026Shimojima YoheiHoninbo　Colors unknown↑21
June 11, 2026Kuwamoto ShinpeiTengen　Colors unknown↑11
May 28, 2026Ikemoto RyotaJudan　Colors unknown↓9
May 14, 2026Ishii KunioGosei　Colors unknown↓24
May 7, 2026Asahi YujunJudan　Colors unknown↑14
April 23, 2026Araki IsseiTengen　Colors unknown↑6
April 16, 2026Abe YoshikiKisei First Tournament Preliminary Semifinal　Colors unknown↓13
April 13, 2026Kasahara YukiJudan　Colors unknown↑10
April 6, 2026Araki IsseiGosei　Colors unknown↑6
March 19, 2026Sumi ShinsukeKisei First Tournament Preliminary Quarterfinal　Colors unknown↑5
March 12, 2026Tanaka ChiekoGosei　Colors unknown↑1
March 5, 2026Goto HajimuJudan　Colors unknown↑18
February 26, 2026Ota RyoKisei First Tournament Preliminary Round 2　Colors unknown↑12
February 16, 2026Tsukuda AkikoTengen　Colors unknown↑6

Head-to-head

Up to 10 opponents, most-played first. Records are from Iwamaru Taira's point of view; jigo and no-result games are not counted as wins or losses. Only games from 1927 onward are included.
OpponentTotalAs BlackAs White
Ishida Atsushi4-7.3640-00-0
Takei Takashi4-6.4000-00-0
Sakaguchi Ryuzo8-2.8000-00-0
Sasaka Shiro7-2.7780-00-0
Araki Issei4-5.4440-01-0
Ishii Kunio4-5.4440-00-0
Sakamoto Yasuo6-2.7500-00-0
Yanaka Katsunori5-3.6250-00-0
Komatsu Daiki2-6.2500-00-1
Hikosaka Naoto1-7.1250-11-4
Tsukuda Akiko6-1.8570-00-0
Kikkawa Hajime4-3.5710-00-0
Tanaka Nobuyuki0-7.0000-00-0
Yamada Kimio2-5.2861-11-1
Sasaki Tsuyoshi4-3.5710-00-1
Kitano Ryo2-5.2860-00-0
Nakano Hironari3-3.5000-01-0
Shimojima Yohei3-3.5000-00-0
Nakane Naoyuki3-3.5000-00-0
Ohashi Naruya4-2.6670-00-0
Tanemura Sayuri6-01.0000-01-0
Enda Hideki5-01.0000-00-0
Takabayashi Masahiro4-1.8000-00-0
Kori Toshio4-1.8000-00-0
Ida Atsushi1-4.2000-20-2
Tanaka Chieko5-01.0000-00-0
Nakamura Shinya2-3.4000-00-0
Yamamoto Kentaro5-01.0000-00-0

Record by year

Counted by calendar year, January to December (default wins and losses are included; jigo and no-result games are not). Only games from 1927 onward are counted, so these totals do not match the career records published by the two Ki-in.

YearRecordWin rate
202615-6.714
202518-11.621
20246-8.429
202312-12.500
202216-10.615
202113-12.520
202014-11.560
201920-14.588
201814-9.609
201717-14.548
201610-11.476
201513-7.650
20145-6.455
20139-5.643
201212-10.545
20117-5.583
20100-1.000
20092-01.000
20081-01.000
20070-2.000
20061-7.125
20059-9.500
200415-9.625
200314-10.583
20026-6.500
Total249-195.561

Calculated from games played between 1927 and 2026 (as of September 17, 2026).