Go Player Ratings

JAAbout ratings

Koyama Kuya

Koyama Kuya (小山空也) has a rating of 1975, ranked 33 of 452 in professional play. Their highest rating so far is 2092 (May 19, 2025).

Koyama Kuya7 dan小山空也Nihon Ki-in Tokyo
Rating1975
Rank33
1-year change↓17
Peak rating2092
Last 10269-160
2026 record
12-7
Record since 1927
269-160
Win rate
.627

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

Professional ratingsFind a player

Rating history — professional

27 gamesHigh 2022Low 1968
97 gamesHigh 2092Low 1945
168 gamesHigh 2092Low 1842
418 gamesHigh 2092Low 1489

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 17, 2026Watanabe KandaiJudan Final　as White↓23
September 3, 2026Rin ShienGosei　Colors unknown↑7
August 24, 2026Fujisawa RinaHoninbo　Colors unknown↑16
August 20, 2026Chang Ruei JieHiroshima Aluminum Cup Wakagoi Preliminary Semifinal　Colors unknown↑7
August 20, 2026Onishi KenyaHiroshima Aluminum Cup Wakagoi Preliminary Final　Colors unknown↓23
August 6, 2026Onishi RyuheiKisei League B2　as White↓11
July 27, 2026U BoiKisei　as Black↑15
July 13, 2026Ueno RisaTengen　Colors unknown↑9
June 29, 2026Cho RiyuMeijin　Colors unknown↓23
June 11, 2026I RyoKisei League B2　as White↓17
June 4, 2026Ishikura NoboruTengen　Colors unknown↑1
May 21, 2026Miura TaroKisei League B2　as Black↑21
April 26, 2026O RisseiNHK Cup Round 1　as Black↑11
April 20, 2026Nakaonoda TomomiMeijin　Colors unknown↑5
April 13, 2026Rin KanketsuKisei League B2　as Black↓17
March 26, 2026Seki RyosukeMeijin　Colors unknown↑4
March 2, 2026Onishi KenyaKisei League B2　as White↑13
February 12, 2026Hon AkiyoshiKisei　as White↑13
January 18, 2026Yu ZhengqiNHK Cup Round 3　as White↓5
December 15, 2025Shida TatsuyaHoninbo Final Preliminary Final　as Black↓13

Head-to-head

Up to 10 opponents, most-played first. Records are from Koyama Kuya'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
Kyo Kagen0-9.0000-30-4
Sotoyanagi Sebun4-4.5000-10-1
Yokotsuka Riki3-5.3751-00-1
Shibano Toramaru1-7.1251-20-3
Fujisawa Rina4-3.5711-02-3
Hirose Yuichi2-4.3331-00-3
Sada Atsushi1-5.1671-20-2
Onishi Ryuhei3-3.5001-01-1
Sun Zhe1-5.1670-11-2
Chang Ruei Jie2-3.4000-10-0
Koike Yoshihiro3-2.6001-00-2
Ogaki Yusaku5-01.0000-01-0
Ueno Asami2-3.4001-21-0
Fujita Akihiko3-2.6001-00-1

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
202612-7.632
202516-15.516
202427-12.692
202324-9.727
202222-12.647
202124-14.632
202015-14.517
201931-14.689
201814-13.518
201727-15.643
201625-15.625
201523-12.657
20148-7.533
20131-1.500
Total269-160.627

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