Go Player Ratings

JAAbout ratings

Cho Kosumi

Cho Kosumi (張心澄) has a rating of 1373, ranked 365 of 452 in professional play. Their highest rating so far is 1495 (July 6, 2020).

Cho Kosumi2 dan張心澄Nihon Ki-in Tokyo
Rating1373
Rank365
1-year change↓28
Peak rating1495
Last 1035-82
2026 record
2-10
Record since 1927
35-82
Win rate
.299

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

Professional ratingsFind a player

Rating history — professional

14 gamesHigh 1400Low 1371
55 gamesHigh 1483Low 1371
94 gamesHigh 1483Low 1354
111 gamesHigh 1495Low 1354

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)

4 gamesHigh 1474Low 1452
21 gamesHigh 1523Low 1452
41 gamesHigh 1545Low 1451
51 gamesHigh 1545Low 1439

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: 1452 (#63)

Recent games

Up to 20 games, newest first. “Change” is the rating movement.
DateOpponent and tournamentResultChange
September 3, 2026Jo BunenHiroshima Aluminum Cup Wakagoi Preliminary Round 1　Colors unknown↓5
August 24, 2026Shimosaka MioriWomen's Kisei　Colors unknown↓12
May 25, 2026Mizokami TomochikaOza　Colors unknown↓2
April 30, 2026Iguchi ToyohideGosei　Colors unknown↓3
April 23, 2026Shiga TsukasaGlobis Cup Japan Preliminary Round 1　as White—
April 13, 2026Awaji ShuzoHoninbo　Colors unknown↓7
March 23, 2026Nakayama KaoruGosei　Colors unknown↑6
February 23, 2026Okada YumikoGosei　Colors unknown↑13
February 16, 2026Inaba TakahiroTengen　Colors unknown↓6
February 9, 2026Kondo ToshikiJudan　Colors unknown↓4
January 22, 2026Shiraishi YuichiKisei First Tournament Preliminary Round 1　Colors unknown↓9
January 12, 2026Kato TomokoSenko Cup Women's Strongest Player Preliminary Semifinal　Colors unknown↓10
December 22, 2025Yanagihara SakiShinjin-O Preliminary　as Black↓7
November 24, 2025Miyamoto ChiharuSenko Cup Women's Strongest Player Preliminary Round 1　Colors unknown↑9
November 17, 2025Suzukawa NatsumiShinjin-O Preliminary　as White↑12
November 10, 2025Arai KantaMeijin　Colors unknown↓11
October 20, 2025Chang FukangTeikei Cup Shun-ei Preliminary Round 1　Colors unknown↓3
October 9, 2025Osawa NarumiWomen's Honinbo Preliminary Round 1　Colors unknown↓8
October 2, 2025Ueno AsamiHiroshima Aluminum Cup Wakagoi Preliminary Round 1　Colors unknown↓1
August 18, 2025Moro ArisaWomen's Kisei　Colors unknown↓7

Head-to-head

Up to 10 opponents, most-played first. Records are from Cho Kosumi'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 Chien1-4.2000-00-1
Yanagihara Saki0-5.0000-30-2
Kato Tomoko0-5.0000-10-0
Kaneko Maki3-1.7500-00-1
Suzuki Ayumi0-4.0000-00-0
Kawahara Yu1-3.2500-10-0
Kuwabara Itsuki1-2.3330-11-0
Kin En2-1.6670-00-0
Jo Bunen0-3.0000-10-0
Nyu Eiko1-2.3330-00-0

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
20262-10.167
20254-16.200
202416-20.444
202311-22.333
202211-18.379
202110-18.357
20200-10.000
Total35-82.299

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