Go Player Ratings

JAAbout ratings

Kato Tomoko

Kato Tomoko (加藤朋子) has a rating of 1398, ranked 346 of 452 in professional play. Their highest rating so far is 1491 (April 20, 2017).

Kato Tomoko6 dan加藤朋子Nihon Ki-in Tokyo
Rating1398
Rank346
1-year change↓20
Peak rating1491
Last 10115-205
2026 record
7-8
Record since 1927
115-205
Win rate
.359

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

Professional ratingsFind a player

Rating history — professional

11 gamesHigh 1402Low 1362
38 gamesHigh 1487Low 1362
73 gamesHigh 1487Low 1298
233 gamesHigh 1491Low 1298

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)

9 gamesHigh 1643Low 1604
38 gamesHigh 1667Low 1556
62 gamesHigh 1667Low 1548
174 gamesHigh 1711Low 1523

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: 1633 (#28)

Recent games

Up to 20 games, newest first. “Change” is the rating movement.
DateOpponent and tournamentResultChange
September 3, 2026Moro ArisaWomen's Kisei　Colors unknown↓10
September 3, 2026Osawa NarumiWomen's Kisei　Colors unknown↑18
August 17, 2026Tajima ShingoSGW Cup Chuyo Preliminary Semifinal　Colors unknown↑24
August 17, 2026Kim HyunjongSGW Cup Chuyo Preliminary Round 1　Colors unknown↑12
August 6, 2026Hara SachikoWomen's Kisei　Colors unknown↑4
August 6, 2026Takeshita NanaWomen's Kisei　Colors unknown↑12
June 11, 2026Takeshita NanaTengen　Colors unknown↓14
May 21, 2026Yamada TakujiOza　Colors unknown↓4
May 14, 2026Miyazaki RyutaroTengen　Colors unknown↑18
April 2, 2026Mitsunaga JunzoHoninbo　Colors unknown↓10
March 19, 2026Tsurumaru KeiichiGosei　Colors unknown↓20
March 12, 2026Xie YiminSenko Cup Women's Strongest Player Preliminary Final　Colors unknown↓6
February 2, 2026Tajiri YutoJudan　Colors unknown↓4
January 19, 2026Kim SujunKisei First Tournament Round 1　as White↓2
January 12, 2026Cho KosumiSenko Cup Women's Strongest Player Preliminary Semifinal　Colors unknown↑10
December 11, 2025Yoshihara YukariTeikei Cup Women's Legend Round 2　as White↓15
November 13, 2025Shuto ShunMeijin　Colors unknown↓3
November 6, 2025Okada YumikoTeikei Cup Women's Legend Round 1　as White↑9
September 29, 2025Osawa KenroSGW Cup Chuyo Preliminary Round 1　as White↓15
September 25, 2025Shimosaka MioriWomen's Honinbo Preliminary Round 1　Colors unknown↓20

Head-to-head

Up to 10 opponents, most-played first. Records are from Kato Tomoko'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
Aoki Kikuyo6-14.3002-43-5
Koyama Terumi7-8.4672-33-1
Yoshida Mika6-8.4294-32-4
Nakazawa Ayako4-9.3082-11-5
Chinen Kaori3-9.2501-32-4
Izawa Akino8-4.6672-03-1
Kobayashi Izumi3-7.3000-23-2
Yashiro Kumiko3-7.3001-10-1
Kin En7-2.7781-01-0
Okada Yumiko8-1.8894-11-0
Cho Chien5-3.6251-01-0
Yoshihara Yukari4-4.5000-20-2
Hara Sachiko8-01.0003-01-0
Shuto Shun1-7.1250-00-1
Ogawa Tomoko4-4.5002-00-4
Komatsu Hideko7-1.8753-01-0
Aoba Kaori2-5.2861-11-1
Sugiuchi Kazuko6-1.8574-01-1
Osawa Narumi3-4.4291-01-1
Kusunoki Teruko7-01.0002-02-0
Kobayashi Chizu4-3.5711-01-3
Kuwabara Yoko4-3.5710-01-0
Mannami Nao4-2.6672-01-0
Suzuki Ayumi0-6.0000-20-0
Kato Keiko4-2.6670-11-0
Moro Arisa0-6.0000-00-0
Mukai Chiaki0-6.0000-20-2
Okuda Aya2-4.3330-10-0
Nagashima Kozue3-2.6000-00-1
Shoji Kazuko5-01.0001-00-0
Takahashi Hideo2-3.4001-00-0
Umezawa Yukari1-4.2000-21-0
Omori Yasushi2-3.4000-00-0
Nakajima Mieko3-2.6002-01-0
Koda Akiko3-2.6000-00-0
Cho Kosumi5-01.0000-01-0

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
20267-8.467
20258-16.333
202414-15.483
202310-13.435
202214-18.438
202110-16.385
20205-13.278
20199-15.375
201811-19.367
20176-19.240
201620-14.588
201510-12.455
20144-7.364
20132-7.222
20128-9.471
201110-9.526
20104-4.500
20092-4.333
20083-4.429
20075-5.500
200611-9.550
20059-15.375
200413-14.481
200321-15.583
20026-16.273
20018-5.615
200010-2.833
19993-4.429
19987-5.583
19973-2.600
19963-5.375
19957-8.467
19949-5.643
19936-10.375
19928-1.889
19912-01.000
Total115-205.359

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