Go Player Ratings

JAAbout ratings

Ko Iun

Ko Iun (熊丰) has a rating of 1499, ranked 268 of 452 in professional play. Their highest rating so far is 1717 (July 29, 2011).

Ko Iun7 dan熊丰Nihon Ki-in TokyoAlso known as: 黄奕昀
Rating1499
Rank268
1-year change↓23
Peak rating1717
Last 10200-193
2026 record
3-6
Record since 1927
200-193
Win rate
.509

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

Professional ratingsFind a player

Rating history — professional

12 gamesHigh 1534Low 1465
48 gamesHigh 1564Low 1446
86 gamesHigh 1564Low 1426
295 gamesHigh 1717Low 1426

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 3, 2026Oya KoichiSGW Cup Chuyo Preliminary Semifinal　Colors unknown↑18
August 3, 2026Mannami KanaSGW Cup Chuyo Preliminary Round 1　Colors unknown↑15
July 2, 2026Obuchi KotaroOza　Colors unknown↓6
May 11, 2026Hosaka MayuOza　Colors unknown↑4
April 27, 2026Takao ShinjiTengen　Colors unknown↓1
April 2, 2026Takahashi HideoHoninbo　Colors unknown↓23
March 12, 2026Kurotaki MasakiGosei　Colors unknown↓14
February 12, 2026Ko ReibunKisei First Tournament Preliminary Round 2　Colors unknown↓14
February 2, 2026Mimura TomoyasuJudan Preliminary C　as White↓6
November 13, 2025Mitani TetsuyaMeijin　Colors unknown↓6
October 2, 2025Anzai NobuakiSGW Cup Chuyo Preliminary Round 2　as Black↓3
October 2, 2025Araki IsseiSGW Cup Chuyo Preliminary Round 1　as Black↑13
July 7, 2025Shiraishi YuichiRyusei　Colors unknown↓14
July 3, 2025Ando KazushigeOza　Colors unknown↓13
June 30, 2025Han ZenkiHoninbo　Colors unknown↓6
June 26, 2025Ohashi HirofumiMeijin　Colors unknown↓9
June 5, 2025Kataoka SatoshiOza　Colors unknown↑25
May 25, 2025Awaji ShuzoTengen　Colors unknown↓11
May 19, 2025Shibano RyunosukeHoninbo　Colors unknown↑13
May 15, 2025Moro ArisaMeijin　Colors unknown↑21

Head-to-head

Up to 10 opponents, most-played first. Records are from Ko Iun'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
Takekiyo Isamu6-01.0000-00-0
Kobayashi Izumi2-4.3330-00-0
Konagai Masaru3-3.5000-00-0
Arimura Hiroshi2-3.4000-00-1
Ando Kazushige1-4.2000-01-0
Ishida Yoshio1-4.2001-10-1
So Yokoku0-5.0000-00-0
Morita Michihiro0-5.0000-00-0
Kawai Shoji4-1.8000-00-0
Inaba Takahiro1-3.2500-00-0

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
20263-6.333
202511-11.500
20246-9.400
20238-11.421
20229-7.563
20214-12.250
20204-8.333
20196-11.353
201817-13.567
201718-11.621
20163-9.250
201510-9.526
20143-6.333
20134-4.500
201211-6.647
20117-7.500
20103-2.600
20092-1.667
20082-1.667
20074-2.667
20068-7.533
200512-11.522
200412-10.545
200321-12.636
200210-6.625
20011-01.000
19981-1.500
Total200-193.509

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