Go Player Ratings

JAAbout ratings

Hara Masakazu

Hara Masakazu (原正和) has a rating of 1804, ranked 83 of 452 in professional play. Their highest rating so far is 1804 (September 16, 2026).

Hara Masakazu5 dan原正和Kansai Ki-in
Rating1804
Rank83
1-year change↑59
Peak rating1804
Last 1077-64
2026 record
8-1
Record since 1927
77-64
Win rate
.546

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

Professional ratingsFind a player

Rating history — professional

10 gamesHigh 1804Low 1751
37 gamesHigh 1804Low 1669
57 gamesHigh 1804Low 1641
136 gamesHigh 1804Low 1459

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 16, 2026Fujii ShuyaTengen Preliminary A　as White↑17
September 9, 2026Fujita ReoOza Preliminary B　as Black↑6
August 19, 2026Hashimoto KanTengen Preliminary B　as White↑8
June 25, 2026Tatsumi AkaneKansai Ki-in First Place Tournament Round 2　as Black↑6
May 27, 2026Yokota ShigeakiJudan Preliminary A　as Black↑13
March 25, 2026Hatanaka HoshinobuKisei First Tournament Round 4　as White↓20
March 11, 2026Watanabe YuKisei First Tournament Preliminary Quarterfinal　Colors unknown↑11
February 11, 2026Utsumi KokiKisei First Tournament Preliminary Round 2　Colors unknown↑12
January 19, 2026Tanaka ChiekoKisei First Tournament Preliminary Round 1　Colors unknown±0
December 3, 2025Yahata NaokiKansai Ki-in First Place Tournament Round 1　as Black↑7
September 8, 2025Takahashi SuketasuKansai Ki-in First Place Tournament Preliminary　as White↑7
August 27, 2025Furuya YutakaHoninbo Preliminary B　as Black↑18
August 6, 2025Maeda RyoGosei Preliminary A　as White↑3
June 19, 2025Fujii ShuyaMeijin Preliminary B　as White↓15
May 21, 2025Kiyonari TetsuyaMeijin Preliminary B　as Black↑18
March 27, 2025Seki KotaroGosei Round 2　as Black↓5
January 30, 2025Nakane NaoyukiKisei First Tournament Preliminary Round 2　Colors unknown↓18
January 16, 2025Fukuoka KotaroGosei Main Tournament Round 1　Colors unknown↑30
November 20, 2024Imabun TaroKansai Ki-in First Place Tournament Round 1　as White↓13
October 30, 2024Yata NaokiGosei Preliminary A　as Black↑12

Head-to-head

Up to 10 opponents, most-played first. Records are from Hara Masakazu'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
Furuya Yutaka3-1.7501-01-1
Murakawa Daisuke0-4.0000-00-3
U Boi2-2.5001-00-0
Hatanaka Hoshinobu0-4.0000-10-1
Watanabe Kandai1-3.2500-00-3
Maeda Ryo4-01.0000-04-0
Okawa Takuya1-2.3331-20-0
Yata Naoki2-1.6671-01-1
Fujii Shuya2-1.6671-01-1
Yahata Naoki2-1.6671-00-1

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
20268-1.889
20256-3.667
20249-5.643
20238-4.667
20223-6.333
20216-5.545
20208-8.500
20195-5.500
20184-5.444
20178-11.421
201611-5.688
20151-4.200
20140-2.000
Total77-64.546

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