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Kobayashi Koichi

Kobayashi Koichi (小林光一) has a rating of 1674, ranked 150 of 452 in professional play. Their highest rating so far is 1891 (May 28, 2006).

Kobayashi Koichi9 dan小林光一Nihon Ki-in Tokyo
Rating1674
Rank150
1-year change↓30
Peak rating1891
Last 101336-796(2 by default)
2026 record
7-6
Record since 1927
1336-796
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

15 gamesHigh 1688Low 1627
56 gamesHigh 1767Low 1627
103 gamesHigh 1772Low 1627
531 gamesHigh 1891Low 1627

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, 2026Cho RiyuOza　Colors unknown↑26
August 20, 2026Mitani TetsuyaTengen　Colors unknown↓9
July 23, 2026Hino ShotaOza　Colors unknown↑12
July 16, 2026Shigekawa AkashiTengen　Colors unknown↑19
April 20, 2026Tsuneishi TakashiKisei First Tournament Preliminary Semifinal　Colors unknown↓12
April 13, 2026Obuchi KotaroHoninbo　Colors unknown↓10
March 26, 2026Yoshihara YukariKisei First Tournament Round 3　as Black↑8
March 12, 2026Arimura HiroshiJudan　Colors unknown↓23
March 5, 2026Hara SachikoKisei First Tournament Preliminary Round 2　Colors unknown↑2
February 26, 2026Chen BoshaoGosei Preliminary C　as White↓17
February 19, 2026O RisseiTeikei Cup Legend Round 1　as Black↓6
February 12, 2026Nakayama KaoruJudan　Colors unknown↑1
January 29, 2026Tahara YasufumiKisei First Tournament Round 1　as White↑7
November 13, 2025Chang FukangMeijin　Colors unknown↓12
October 6, 2025Cho SonjinOza Preliminary B Final　as White↓16
September 15, 2025Izumitani HideoOza　Colors unknown↑10
September 1, 2025Ohashi HirofumiTengen Preliminary B Final　as Black↓16
August 25, 2025Aoki KikuyoOza Preliminary C　as White↑5
July 24, 2025So YokokuHoninbo Preliminary B　as Black↓11
July 14, 2025Hashimoto YujiroRyusei　Colors unknown↑10

Head-to-head

Up to 10 opponents, most-played first. Records are from Kobayashi Koichi'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
Cho Chikun66-66.50032-3333-32
Kato Masao51-60.46023-2628-34
Rin Kaiho55-34.61833-1620-18
Otake Hideo55-26.67927-1326-12
Takemiya Masaki39-36.52025-1414-22
Yoda Norimoto23-23.50010-1112-12
O Rissei24-22.5229-1315-7
Yamashiro Hiroshi21-17.55311-69-10
Kobayashi Satoru21-17.55310-711-10
Ishida Yoshio16-19.4574-1212-6
Awaji Shuzo19-13.5947-411-6
Sakata Eio21-9.70014-77-2
Kataoka Satoshi21-9.70010-19-8
Ryu Shikun17-12.5866-47-8
O Meien12-13.4805-67-6
Hikosaka Naoto10-15.4004-55-6
Takagi Shoichi12-11.5224-68-5
Yamashita Keigo11-11.5006-54-6
Honda Kunihisa16-5.76211-24-3
Kudo Norio14-6.7008-36-2
Fujisawa Shuko12-8.6009-43-4
Yamada Kimio10-10.5002-35-4
Komatsu Hideki12-6.6676-25-3
Ishida Akira15-3.8339-26-1
Yuki Satoshi7-11.3893-34-6
Hashimoto Shoji11-7.6118-33-4
Sakai Takeshi13-5.7223-47-0
Hane Yasumasa14-3.8247-06-3
Ishii Kunio12-4.7506-16-3
Yamabe Toshiro6-9.4004-22-7
Miyazawa Goro11-3.7867-02-2
Hashimoto Yujiro13-01.0008-01-0
Imamura Toshiya7-6.5384-23-3
Takao Shinji5-8.3853-20-5
Kojima Takaho10-2.8334-16-1
Sonoda Yuichi6-6.5003-23-4
Mimura Tomoyasu6-6.5003-32-1
Chino Tadahiko8-4.6675-13-2
Hane Naoki9-2.8182-14-1
Ohira Shuzo5-5.5004-21-3
Iwata Tatsuaki8-2.8002-16-1
Hashimoto Utaro8-2.8005-13-1
Tono Hiroaki8-2.8005-13-1
Kamimura Haruo7-3.7003-04-3
Sugiuchi Masao8-2.8003-03-2
Nakano Hironari7-2.7782-14-0
Shiraishi Yutaka8-1.8894-04-1
Ko Iso4-5.4441-33-1
Nakamura Hidehito9-01.0006-02-0
Sanno Hirotaka8-1.8896-00-1
Kato Atsushi5-4.5563-21-2
Cho U4-5.4441-31-2
Ishigure Ikuro6-3.6672-13-2
Cho Sonjin7-2.7784-02-2
Shimamura Toshihiro9-01.0004-05-0
Magari Reiki8-01.0003-05-0
Ogaki Yusaku5-3.6252-12-1
Haruyama Isamu7-1.8751-06-1
Ando Kazushige6-1.8572-03-1
Iguchi Toyohide6-1.8572-11-0
Kajiwara Takeo6-1.8573-03-1
Yamada Takuji4-3.5713-30-0
Morita Michihiro3-4.4291-20-2
Mitani Tetsuya4-3.5710-10-1
Lee Ishu4-3.5711-12-1
Nakaonoda Tomomi2-5.2860-21-1
Rin Shien1-5.1670-10-2
Cho Riyu3-3.5000-01-2
Fujisawa Hosai4-2.6671-03-2
Kamimura Kunio5-1.8333-02-1
Abe Yoshiteru5-1.8333-11-0
Mukai Chiaki6-01.0001-02-0
Kim Sujun3-3.5002-11-2
Kiyonari Tetsuya3-3.5002-11-0
Tanimiya Teiji5-01.0003-01-0
Mitsunaga Junzo5-01.0002-02-0
Tei Meiko4-1.8003-00-0
Tsuruyama Atsushi2-3.4000-11-0
Onishi Ryuhei0-5.0000-10-2
Shiraishi Yuichi4-1.8000-12-0
So Yokoku2-3.4000-11-2
Xie Yimin4-1.8002-01-1
Takanashi Seiken3-2.6002-00-2
Fukui Masaaki5-01.0003-02-0
Suzuki Ayumi3-2.6002-10-1
Ushinohama Satsuo2-3.4000-32-0
Mizokami Tomochika4-1.8001-11-0
Han Zenki3-2.6001-11-1
Nakamura Shinya2-3.4000-20-0
Sonoda Yasutaka4-1.8001-02-1

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
20267-6.538
202510-10.500
202410-10.500
202314-10.583
202211-11.500
202112-9.571
202010-9.526
201917-10.630
201814-17.452
201726-13.667
201623-13.639
20159-11.450
201416-14.533
201310-10.500
201214-12.538
201116-16.500
201012-11.522
200917-8.680
200822-14.611
200720-10.667
200617-17.500
200514-15.483
200434-22.607
200333-15.688
200228-18.609
200125-16.610
200021-22.488
199937-18.673
199826-14.650
199731-16.660
199628-14.667
199530-21.588
199427-23.540
199321-15.583
199236-26.581
199129-21.580
199037-18.673
198921-14.600
198840-16.714
198724-23.511
198629-17.630
198546-16.742
198437-17.685
198332-21.604
198240-17.702
198135-17.673
198034-13.723
197929-13.691
197824-14.632
197721-9.700
197631-8.795
197523-8.742
197423-11.676
197324-9.727
197234-8.809
197118-5.783
19705-3.625
19691-2.333
19681-01.000
Total1336-796.627

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