Go Player Ratings

JAAbout ratings

Ko Iso

Ko Iso (黄翊祖) has a rating of 2046, ranked 22 of 452 in professional play. Their highest rating so far is 2062 (August 6, 2026).

Ko Iso9 dan黄翊祖Nihon Ki-in Tokyo
Rating2046
Rank22
1-year change↑45
Peak rating2062
Last 10471-325(1 by default)
2026 record
15-7
Record since 1927
471-325
Win rate
.592

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

Professional ratingsFind a player

Rating history — professional

26 gamesHigh 2062Low 2005
91 gamesHigh 2062Low 1853
146 gamesHigh 2062Low 1819
686 gamesHigh 2062Low 1725

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 14, 2026Ida AtsushiJudan Final　as Black↓12
September 10, 2026Akiyama JiroKisei　as Black↑7
September 3, 2026Horimoto MitsunariMeijin　Colors unknown↑5
August 27, 2026Shuto ShunGosei　Colors unknown↑10
August 23, 2026Shibano ToramaruNHK Cup Main Tournament Round 2　Colors unknown↓4
August 20, 2026Nishi TakenobuJudan Final Preliminary Round 1　as White↑7
August 13, 2026Morita MichihiroKisei　Colors unknown↓27
August 6, 2026Cho UMeijin　Colors unknown↑18
July 23, 2026Hamakado HibikiJudan　Colors unknown↑5
July 16, 2026Suzuki ShinjiHoninbo　Colors unknown↓17
July 9, 2026Furuya YutakaKisei　Colors unknown↑4
July 2, 2026Kobayashi IzumiTengen　Colors unknown↑3
June 25, 2026Iguchi ToyohideMeijin　Colors unknown↑5
June 11, 2026So YokokuJudan　Colors unknown↑9
May 31, 2026Yuki SatoshiNHK Cup Round 1　as Black↑6
May 28, 2026Taniguchi ToruKisei　Colors unknown↓24
May 21, 2026Arimura HiroshiHoninbo　Colors unknown↑1
May 7, 2026Sonoda YasutakaMeijin　Colors unknown↑2
April 9, 2026Motoki KatsuyaOza Final Preliminary Final　as Black↓9
March 30, 2026Rin KanketsuMeijin　Colors unknown↑14

Head-to-head

Up to 10 opponents, most-played first. Records are from Ko Iso'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
Hane Naoki9-14.3913-64-7
Yamashita Keigo6-16.2732-114-3
Cho U5-16.2382-92-6
Takao Shinji3-14.1761-51-8
Kono Rin4-12.2501-52-5
Yoda Norimoto5-9.3573-22-5
So Yokoku6-7.4620-02-3
Iyama Yuta1-12.0771-70-5
Ryu Shikun8-5.6153-33-2
Kobayashi Satoru7-5.5833-13-2
Yamada Kimio6-6.5002-23-4
Yuki Satoshi6-6.5004-32-3
Cho Chikun6-5.5452-32-2
Murakawa Daisuke4-6.4002-12-5
Mimura Tomoyasu8-1.8894-01-0
Yu Zhengqi4-5.4440-33-1
Kobayashi Koichi5-4.5561-33-1
Shibano Toramaru3-6.3333-50-0
Hirata Tomoya4-5.4442-11-1
Akiyama Jiro7-1.8752-13-0
Shida Tatsuya2-6.2501-00-5
Tsuruyama Atsushi6-2.7501-03-1
Sakai Hideyuki4-4.5003-21-2
Mitani Tetsuya3-5.3750-21-1
Ichiriki Ryo2-6.2501-20-2
Seto Taiki5-3.6251-13-2
Motoki Katsuya2-5.2861-41-0
Shuto Shun6-1.8573-10-0
Cho Riyu2-5.2860-01-1
O Meien2-5.2860-12-3
Fujita Akihiko3-4.4290-10-1
Suzuki Shinji3-4.4290-11-0
Anzai Nobuaki5-1.8333-00-0
Takemiya Masaki3-3.5001-11-2
Yamashiro Hiroshi4-2.6672-11-0
Xie Yimin5-1.8330-12-0
Ida Atsushi2-4.3331-21-2
Matsumoto Takehisa3-3.5001-11-1
Sun Zhe1-5.1670-00-3
Han Zenki3-3.5000-01-1
Kataoka Satoshi4-2.6671-10-0
Nakaonoda Tomomi3-3.5000-11-1
Nakano Hironari3-2.6001-12-1
Kudo Norio4-1.8002-11-0
Uchida Shuhei2-3.4000-01-0
Ogaki Yusaku4-1.8000-00-0
Terayama Rei5-01.0000-00-0
Oba Junya5-01.0001-01-0
Morita Michihiro4-1.8000-01-0
Mizokami Tomochika3-2.6000-01-0
Rin Kanketsu3-2.6000-22-0
Cho Sonjin4-1.8003-10-0

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
202615-7.682
202520-10.667
202425-7.781
202315-11.577
202219-13.594
202113-12.520
202011-17.393
201925-20.556
201824-21.533
201726-22.542
201627-14.658
201522-13.629
201423-13.639
20139-10.474
201218-17.514
201125-11.694
20109-9.500
200910-14.417
200828-15.651
200715-22.405
200621-18.538
200526-11.703
200426-7.788
200314-9.609
20025-2.714
Total471-325.592

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