Go Player Ratings

JAAbout ratings

Cho Koharu

Cho Koharu (張心治) has a rating of 1278, ranked 413 of 452 in professional play. Their highest rating so far is 1485 (August 22, 2022).

Cho Koharu1 dan張心治Nihon Ki-in Tokyo
Rating1278
Rank413
1-year change↓49
Peak rating1485
Last 1016-64
2026 record
4-13
Record since 1927
16-64
Win rate
.200

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 1318Low 1268
54 gamesHigh 1383Low 1268
74 gamesHigh 1485Low 1268
74 gamesHigh 1485Low 1268

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)

6 gamesHigh 1483Low 1438
23 gamesHigh 1483Low 1424
34 gamesHigh 1491Low 1424
34 gamesHigh 1491Low 1424

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: 1479 (#55)

Recent games

Up to 20 games, newest first. “Change” is the rating movement.
DateOpponent and tournamentResultChange
September 10, 2026Jo BunenWomen's Kisei Preliminary B　as Black↓4
August 27, 2026Mannami NaoWomen's Kisei　Colors unknown↑21
August 10, 2026Nyu EikoHiroshima Aluminum Cup Wakagoi Preliminary Round 1　Colors unknown↓3
May 27, 2026Yoshida TomaIwamoto Kaoru Memorial Masuda Cup Main Tournament　Colors unknown↓4
May 27, 2026Saga ShuntaroIwamoto Kaoru Memorial Masuda Cup Main Tournament　Colors unknown↓6
May 26, 2026Obata MinoriIwamoto Kaoru Memorial Masuda Cup Main Tournament　Colors unknown↑24
May 26, 2026Yanagihara SakiIwamoto Kaoru Memorial Masuda Cup Main Tournament　Colors unknown↓3
May 11, 2026Yamada ShinjiOza　Colors unknown↓4
April 20, 2026Jo BunenGlobis Cup Japan Representative Playoff Round 1　Colors unknown—
April 9, 2026Iguchi ToyohideHoninbo　Colors unknown↓2
March 26, 2026Yamamoto MasatoTengen　Colors unknown↓13
March 19, 2026Kanda EiJudan　Colors unknown↓8
March 12, 2026Nyu EikoSenko Cup Women's Strongest Player Preliminary Final　Colors unknown↓2
February 26, 2026Jo BunenGosei　Colors unknown↓5
February 19, 2026Miyamoto ChiharuJudan　Colors unknown↑6
February 5, 2026Chujo ChihiroSenko Cup Women's Strongest Player Preliminary Semifinal　Colors unknown↑11
January 22, 2026Toyoda HirohitoKisei First Tournament Preliminary Round 1　Colors unknown↓4
November 27, 2025Kim HyunjongSenko Cup Women's Strongest Player Preliminary Round 1　Colors unknown↑16
November 20, 2025Ishikura NoboruMeijin　Colors unknown↓10
November 13, 2025Nakahama KonosukeShinjin-O Preliminary Round 1　Colors unknown↓6

Head-to-head

Up to 10 opponents, most-played first. Records are from Cho Koharu'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
Yanagihara Saki1-3.2500-11-0
Jo Bunen0-4.0000-10-0
Nyu Eiko0-4.0000-10-0
Takeshita Nana0-3.0000-00-1
Yokota Hinano0-3.0000-00-0
Suzuki Ayumi0-3.0000-00-0
Moro Arisa0-3.0000-00-0
Obata Minori1-2.3330-10-0
Seki Ryosuke0-2.0000-10-1
Arai Kanta0-2.0000-10-1

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
20264-13.235
202511-21.344
20247-20.259
20235-22.185
20222-9.182
Total16-64.200

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