Go Player Ratings

JAAbout ratings

Ito Masashi

Ito Masashi (伊藤優詩) has a rating of 1839, ranked 67 of 452 in professional play. Their highest rating so far is 1839 (September 14, 2026).

Ito Masashi6 dan伊藤優詩Nihon Ki-in Tokyo
Rating1839
Rank67
1-year change↑52
Peak rating1839
Last 10220-165
2026 record
15-4
Record since 1927
220-165
Win rate
.571

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

Professional ratingsFind a player

Rating history — professional

23 gamesHigh 1839Low 1720
81 gamesHigh 1839Low 1679
128 gamesHigh 1839Low 1660
382 gamesHigh 1839Low 1467

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 14, 2026Inaba TakahiroGosei Preliminary A　as White↑13
August 17, 2026Ohashi HirofumiSGW Cup Chuyo Preliminary Semifinal　Colors unknown↑12
August 17, 2026Komatsu DaikiSGW Cup Chuyo Preliminary Round 1　Colors unknown↑8
August 10, 2026U BoiJudan Final Preliminary Round 1　Colors unknown↑22
August 6, 2026Matsumoto TakehisaTengen　Colors unknown↓17
July 16, 2026Kono RinJudan　Colors unknown↑28
July 9, 2026Saga ShuntaroOza　Colors unknown↓25
June 22, 2026Nyu EikoTengen　Colors unknown↑12
June 15, 2026Terayama ReiJudan Preliminary A　as White↑21
June 4, 2026Yoda OzoraOza　Colors unknown↑11
May 28, 2026Yamashita KeigoHoninbo　Colors unknown↓6
May 18, 2026Suzuki YoshimichiJudan　Colors unknown↑10
April 27, 2026Miyatani FugaTengen　Colors unknown↑10
March 26, 2026Mitsunaga JunzoJudan　Colors unknown↑8
March 5, 2026Kudo NorioTengen　Colors unknown↑4
February 26, 2026Omori YasushiJudan　Colors unknown↑9
February 12, 2026O YuininKisei First Tournament Preliminary Round 2　Colors unknown↓30
January 29, 2026Okada YumikoJudan　Colors unknown↑2
January 15, 2026Shimosaka MioriKisei First Tournament Preliminary Round 1　Colors unknown↑4
November 24, 2025Yanagihara SakiMeijin　Colors unknown↓23

Head-to-head

Up to 10 opponents, most-played first. Records are from Ito Masashi'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
Yo Chito1-5.1670-10-0
Terayama Rei3-2.6001-01-1
Katsura Atsushi5-01.0000-00-0
Otake Hideo4-1.8002-11-0
Ryu Shikun3-2.6001-11-0
Izumitani Masanori4-01.0000-01-0
Seki Kotaro1-3.2500-00-1
Tajiri Yuto2-2.5000-00-1
Shiraishi Yuichi2-2.5001-00-0
Koike Yoshihiro2-2.5000-00-1

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
202615-4.789
202516-11.593
202420-8.714
202315-12.556
202212-10.545
202116-9.640
20209-9.500
201910-12.455
201820-13.606
201720-15.571
201616-11.593
201511-11.500
20148-6.571
20137-11.389
201213-10.565
20118-8.500
20102-1.667
20091-1.500
20081-3.250
Total220-165.571

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