Go Player Ratings

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Tanaka Koyu

Tanaka Koyu (田中康湧) has a rating of 1912, ranked 44 of 452 in professional play. Their highest rating so far is 1967 (January 8, 2025).

Tanaka Koyu5 dan田中康湧Kansai Ki-in
Rating1912
Rank44
1-year change↓12
Peak rating1967
Last 10125-89
2026 record
10-8
Record since 1927
125-89
Win rate
.584

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

Professional ratingsFind a player

Rating history — professional

32 gamesHigh 1938Low 1865
105 gamesHigh 1967Low 1865
169 gamesHigh 1967Low 1658
204 gamesHigh 1967Low 1478

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
September 16, 2026Nishi TakenobuKisei League C　as White↑12
August 19, 2026Kiwada KazuomiGosei Preliminary A Semifinal　as White↑2
August 3, 2026Kasahara YukiHiroshima Aluminum Cup Wakagoi Preliminary Semifinal　Colors unknown↑4
August 3, 2026U BoiHiroshima Aluminum Cup Wakagoi Preliminary Final　Colors unknown↑19
July 16, 2026Tsuruta KazushiKisei　Colors unknown↓10
July 8, 2026Yuki SatoshiMeijin　Colors unknown↓22
June 25, 2026Ryu ShikunKisei League C Round 2　as Black↑15
June 10, 2026U BoiJudan Preliminary A Final　as Black↓14
June 4, 2026Akiyama JiroKisei League C Round 1　as White↑17
May 3, 2026Sun ZheNHK Cup Round 1　as Black↓14
April 15, 2026Mishima HibikiJudan Preliminary A　as Black↑2
April 9, 2026Sada AtsushiKansai Ki-in First Place Tournament Round 3　as Black↓11
March 19, 2026Watanabe KandaiKansai Ki-in First Place Tournament Round 2　as White↑10
February 8, 2026Sakai YukiNHK Cup Round 4　as Black↓8
January 29, 2026Seto TaikiKansai Ki-in First Place Tournament Round 1　as Black↑20
January 25, 2026Hirose YuichiNHK Cup Round 3　as White↑26
January 21, 2026Nishimura JinShinjin-O Preliminary　as Black↓27
January 7, 2026Yuki SatoshiTengen Preliminary A Final　as Black↓20
December 24, 2025Tsuji ShigehitoTeikei Cup Shun-ei League　as White↑13
December 23, 2025Tanaka KentaroTeikei Cup Shun-ei League　as Black↓28

Head-to-head

Up to 10 opponents, most-played first. Records are from Tanaka Koyu'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
Sada Atsushi0-9.0000-50-3
Tsuji Shigehito4-2.6673-11-1
Nishi Takenobu2-4.3330-12-3
Sakai Yuki0-6.0000-20-3
Otake Yu2-3.4001-11-2
Imamura Toshiya3-1.7501-02-1
Taniguchi Toru1-3.2500-11-2
Hirose Yuichi3-1.7501-01-1
Fujii Shuya3-1.7502-11-0
U Boi2-2.5001-10-1

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
202610-8.556
202523-15.605
202425-13.658
202315-16.484
202228-13.683
202111-9.550
20207-5.583
20195-5.500
20181-4.200
20170-1.000
Total125-89.584

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