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Obuchi Kotaro

Obuchi Kotaro (大淵浩太郎) has a rating of 1712, ranked 128 of 452 in professional play. Their highest rating so far is 1881 (May 6, 2024).

Obuchi Kotaro6 dan大淵浩太郎Nihon Ki-in Tokyo
Rating1712
Rank128
1-year change↓42
Peak rating1881
Last 10233-179
2026 record
8-7
Record since 1927
233-179
Win rate
.566

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

Professional ratingsFind a player

Rating history — professional

17 gamesHigh 1802Low 1712
69 gamesHigh 1881Low 1712
117 gamesHigh 1881Low 1712
410 gamesHigh 1881Low 1458

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 3, 2026Fujimura YosukeOza　Colors unknown↓20
August 6, 2026Nagashima KozueOza　Colors unknown↑3
August 3, 2026Fujita AkihikoSGW Cup Chuyo Preliminary Round 1　Colors unknown↓4
July 2, 2026Ko IunOza　Colors unknown↑6
June 25, 2026Oomote TakutoHoninbo　Colors unknown↓15
June 18, 2026Shigekawa AkashiGosei　Colors unknown↓20
June 11, 2026Sotoyanagi SebunTengen　Colors unknown↓15
June 1, 2026Kasai KojiOza　Colors unknown↑1
May 14, 2026Yo ChitoJudan　Colors unknown↓14
April 20, 2026Akiyama JiroKisei First Tournament Preliminary Semifinal　Colors unknown↓13
April 13, 2026Kobayashi KoichiHoninbo　Colors unknown↑10
April 2, 2026Tahara YasufumiTengen　Colors unknown↑4
March 19, 2026Fujisawa RinaKisei First Tournament Round 3　as Black↑24
February 23, 2026Xie YiminKisei First Tournament Round 2　as White↑16
January 19, 2026Aoki HirotakaKisei First Tournament Preliminary Round 1　Colors unknown↑13
November 10, 2025Tanaka YukiMeijin Preliminary C　as Black↓11
November 5, 2025Anzai NobuakiRyusei Championship Tournament Round 1　Colors unknown↓8
August 21, 2025Hirata TomoyaTengen Preliminary B　as White↓5
August 18, 2025Shuto ShunSGW Cup Chuyo Preliminary Final　as Black↓16
August 18, 2025Izawa AkinoSGW Cup Chuyo Preliminary Round 2　as Black↑3

Head-to-head

Up to 10 opponents, most-played first. Records are from Obuchi Kotaro'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
Yoda Norimoto1-7.1250-20-1
Inaba Takahiro2-4.3331-20-0
Anzai Nobuaki3-3.5000-00-1
Chang Ruei Jie0-6.0000-10-0
Kazama Jun3-3.5000-00-0
Tajiri Yuto3-2.6000-00-0
Yamada Takuji3-2.6001-00-0
Xie Yimin4-1.8000-02-0
Suzuki Ayumi4-1.8001-00-1
Sotoyanagi Sebun1-4.2000-00-0
Cho U2-3.4001-01-1
Ohashi Hirofumi3-2.6000-01-1
Suzuki Shinji0-5.0000-20-1
Kim Sujun1-4.2000-00-0

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
20268-7.533
202513-11.542
202416-9.640
202312-10.545
202216-11.593
202118-9.667
202010-9.526
201917-12.586
201810-15.400
201721-18.538
201616-12.571
201518-12.600
201414-8.636
201315-8.652
201217-8.680
20114-10.286
20102-2.500
20094-6.400
20082-01.000
20060-2.000
Total233-179.566

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