Go Player Ratings

JAAbout ratings

Hara Sachiko

Hara Sachiko (原幸子) has a rating of 1149, ranked 433 of 452 in professional play. Their highest rating so far is 1482 (August 20, 2009).

Hara Sachiko4 dan原幸子Nihon Ki-in Tokyo
Rating1149
Rank433
1-year change↓4
Peak rating1482
Last 1020-96
2026 record
1-7
Record since 1927
20-96
Win rate
.172

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

Professional ratingsFind a player

Rating history — professional

8 gamesHigh 1171Low 1146
27 gamesHigh 1231Low 1146
44 gamesHigh 1259Low 1146
111 gamesHigh 1482Low 1146

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)

3 gamesHigh 1281Low 1275
13 gamesHigh 1360Low 1275
26 gamesHigh 1412Low 1275
62 gamesHigh 1541Low 1275

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: 1275 (#83)

Recent games

Up to 20 games, newest first. “Change” is the rating movement.
DateOpponent and tournamentResultChange
August 6, 2026Kato TomokoWomen's Kisei　Colors unknown↓4
May 11, 2026Kubo HideoOza　Colors unknown↓3
April 16, 2026O YuininHoninbo　Colors unknown↓9
March 26, 2026Jo BunenJudan　Colors unknown↓2
March 23, 2026Mizuma ToshifumiGosei　Colors unknown↓5
March 5, 2026Kobayashi KoichiKisei First Tournament Preliminary Round 2　Colors unknown↓2
February 16, 2026Tsuneishi TakashiTengen　Colors unknown↓1
January 29, 2026Tamai ShinJudan　Colors unknown↑25
December 15, 2025Ko MoseiMeijin　Colors unknown↓7
December 4, 2025Mori ChisakiSenko Cup Women's Strongest Player Preliminary Round 1　Colors unknown↓2
October 30, 2025Xie YiminWomen's Honinbo Preliminary Round 1　Colors unknown↓1
August 18, 2025Kato TomokoWomen's Kisei　Colors unknown↓4
July 24, 2025Ueno RisaOza　Colors unknown↓1
July 14, 2025Miyazaki RyutaroRyusei　Colors unknown↓7
June 9, 2025Cho KoharuWomen's Meijin　Colors unknown↓10
May 12, 2025Takano HidekiHoninbo　Colors unknown↓6
April 28, 2025Ando KazushigeTengen　Colors unknown↓3
April 3, 2025Kono TakashiJudan　Colors unknown↓3
March 20, 2025Kikuchi YoshioMeijin　Colors unknown↓15
February 17, 2025Rafif Shidqi FitrahAgon Kiriyama Cup　Colors unknown↓4

Head-to-head

Up to 10 opponents, most-played first. Records are from Hara Sachiko'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
Kato Tomoko0-8.0000-10-3
Nakazawa Ayako4-3.5711-11-1
Sugiuchi Kazuko2-5.2861-30-1
Kin En1-5.1670-00-0
Koyama Terumi1-4.2001-10-1
Ueno Risa0-5.0000-00-0
Nakayama Kaoru3-1.7500-01-0
Nagashima Kozue1-3.2500-00-0
Okada Yumiko0-4.0000-10-1
Mannami Kana2-2.5001-10-0

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
20261-7.125
20250-14.000
20242-12.143
20231-16.059
20222-11.154
20212-14.125
20202-8.200
20190-3.000
20172-3.400
20164-10.286
20157-15.318
20142-4.333
20131-6.143
20120-7.000
20111-6.143
20100-1.000
20090-5.000
20081-1.500
20071-1.500
20011-2.333
20002-3.400
19990-2.000
19983-5.375
19971-01.000
19940-2.000
19932-4.333
19925-4.556
19915-4.556
19906-3.667
19894-4.500
19882-01.000
Total20-96.172

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