Go Player Ratings

JAAbout ratings

Ko Mosei

Ko Mosei (黄孟正) has a rating of 1403, ranked 345 of 452 in professional play. Their highest rating so far is 1706 (October 14, 2011).

Ko Mosei9 dan黄孟正Nihon Ki-in Tokyo
Rating1403
Rank345
1-year change↑23
Peak rating1706
Last 10170-243
2026 record
4-7
Record since 1927
170-243
Win rate
.412

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

Professional ratingsFind a player

Rating history — professional

13 gamesHigh 1436Low 1385
41 gamesHigh 1436Low 1329
67 gamesHigh 1439Low 1329
262 gamesHigh 1706Low 1329

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
July 16, 2026Takemiya YokoOza　Colors unknown↓10
June 4, 2026Tanaka YukiTengen　Colors unknown↓2
April 2, 2026Awaji ShuzoGosei　Colors unknown↓8
March 26, 2026Yoda NorimotoKisei First Tournament Round 3　as White↓3
March 23, 2026Yoshida TomaHoninbo　Colors unknown↓10
March 16, 2026Onda YasuhikoTengen　Colors unknown↑14
March 5, 2026Saga ShuntaroKisei First Tournament Preliminary Round 2　Colors unknown↑22
February 26, 2026Takayama NonokaGosei　Colors unknown↑13
February 19, 2026Shoji KazukoTengen　Colors unknown↑2
February 2, 2026Ando KazushigeJudan　Colors unknown↓7
January 26, 2026Takao ShinjiMeijin Preliminary B　as White↓1
December 15, 2025Hara SachikoMeijin　Colors unknown↑7
November 17, 2025Kanno NaomiMeijin　Colors unknown↑7
September 4, 2025Takei TaishinOza　Colors unknown↓4
August 7, 2025Takemiya MasakiOza　Colors unknown↑26
July 14, 2025O RisseiRyusei　Colors unknown↓2
July 14, 2025Tsurumaru KeiichiRyusei　Colors unknown↑13
June 19, 2025Adachi ToshimasaHoninbo　Colors unknown↓1
June 12, 2025Moro ArisaTengen　Colors unknown↓7
June 2, 2025Nakazawa AyakoOza　Colors unknown↑14

Head-to-head

Up to 10 opponents, most-played first. Records are from Ko Mosei'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
Hashimoto Yujiro3-2.6001-00-1
Sugimoto Akira4-1.8000-00-0
Aragaki Takeshi1-4.2001-10-0
Ishida Yoshio1-4.2001-10-1
Kato Atsushi2-3.4000-00-0
Ohashi Hirofumi0-5.0000-10-1
Nakazawa Ayako4-01.0000-00-0
Tei Meiko2-2.5000-10-0
Ko Iun0-4.0000-00-0
Adachi Toshimasa0-4.0000-10-0

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
20264-7.364
20257-9.438
20244-8.333
20233-10.231
20224-8.333
20213-9.250
20202-8.200
20199-12.429
20185-11.313
201715-13.536
201610-10.500
20158-10.444
20145-4.556
20134-6.400
20124-10.286
201113-6.684
20100-1.000
20091-1.500
20081-3.250
20072-1.667
20064-7.364
200518-7.720
20049-10.474
20033-9.250
20023-8.273
20002-2.500
19990-2.000
19970-2.000
19960-1.000
19951-1.500
19940-1.000
19930-2.000
19924-4.500
19911-1.500
19900-3.000
19890-3.000
19881-5.167
19871-2.333
19861-5.167
19856-6.500
19842-3.400
19834-2.667
19824-3.571
19811-3.250
19801-2.333
19790-1.000
19780-1.000
Total170-243.412

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