Go Player Ratings

JAAbout ratings

Osuka Seira

Osuka Seira (大須賀聖良) has a rating of 1309. Their highest rating so far is 1544 (January 6, 2022).

Retired. The rating shown is the rating at retirement.

Osuka Seira3 dan大須賀聖良Nihon Ki-in Tokyo
Rating1309
Rank—
1-year change—
Peak rating1544
Last 1037-72
2025 record
2-11
Record since 1927
37-72
Win rate
.339

Rating at retirement (not included in the rating list)

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

Professional ratingsFind a player

Rating history — professional

30 gamesHigh 1403Low 1309
66 gamesHigh 1544Low 1309
105 gamesHigh 1544Low 1309

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

Rating history in the women's tournaments pool (for reference)

19 gamesHigh 1581Low 1521
38 gamesHigh 1581Low 1508
55 gamesHigh 1581Low 1467

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

Ratings in other pools

Ratings for general play and for women's tournaments are calculated independently and do not affect each other.

  • Women's tournaments: 1535　Rating at retirement (not included in the rating list)

Recent games

Up to 20 games, newest first. “Change” is the rating movement.
DateOpponent and tournamentResultChange
July 3, 2025Kaneko MakiOza　Colors unknown↓18
June 19, 2025Mannami NaoWomen's Meijin　Colors unknown↓15
June 9, 2025Hashimoto YujiroTengen　Colors unknown↓7
May 8, 2025Endo YoshifumiHoninbo　Colors unknown↓12
April 21, 2025Moro ArisaGosei　Colors unknown↓6
April 7, 2025Kondo ToshikiMeijin　Colors unknown↓5
March 20, 2025Okada ShinichiroJudan　Colors unknown↓12
March 13, 2025O YuininMeijin　Colors unknown↑11
February 17, 2025Onda YasuhikoAgon Kiriyama Cup　Colors unknown↓18
February 13, 2025Mori ChisakiWomen's Tachiaoi Cup Preliminary　as Black↓9
February 8, 2025Tsuji HanaWomen's Honinbo Preliminary Final　Colors unknown↓10
February 6, 2025Moro ArisaWomen's Honinbo Preliminary　as Black↓11
January 23, 2025Cho SonjinGosei　Colors unknown↑30
December 23, 2024Hane AyakaWomen's Tachiaoi Cup Preliminary Round 2　Colors unknown↑18
December 19, 2024Kanazawa HideoKisei First Tournament Preliminary Round 1　Colors unknown↓3
December 5, 2024Komatsu HidekoWomen's Tachiaoi Cup Preliminary　Colors unknown↑8
November 28, 2024Yoshihara YukariSenko Cup Women's Strongest Player Preliminary　as White↓13
November 7, 2024Yoda OzoraShinjin-O Preliminary Round 1　Colors unknown↓8
October 31, 2024Shimosaka MioriWomen's Honinbo Preliminary　as Black↑18
October 23, 2024Cho ChienWomen's Honinbo Preliminary Round 1　Colors unknown↑22

Head-to-head

Up to 10 opponents, most-played first. Records are from Osuka Seira'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
Moro Arisa3-6.3330-20-1
Mimura Kaori1-4.2000-01-0
Tsuji Hana0-5.0000-00-1
Nyu Eiko2-2.5000-01-0
Ueno Risa0-4.0000-10-1
Yoshihara Yukari2-1.6670-01-1
Xie Yimin0-3.0000-10-0
Kobayashi Izumi1-2.3330-00-0
Kuwabara Yoko2-1.6670-00-0
Cho Kosumi2-1.6670-00-0

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
20252-11.154
20249-17.346
20238-17.320
20229-20.310
202118-17.514
20209-17.346
20195-5.500
Total37-72.339

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