Koyama Yasuo

Koyama Yasuo (小山靖男) has a rating of 1516.

Retired. The rating shown is the rating at retirement.

Koyama Yasuo9 dan小山靖男Kansai Ki-in

Rating1516

Rank—

1-year change—

Peak rating—

Last 1025-52

2000 record: 0-1
Record since 1927: 25-52
Win rate: .325

Rating at retirement (not included in the rating list)

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

Professional ratings Find a player

Recent games

Up to 20 games, newest first. “Change” is the rating movement.
Date	Opponent and tournament	Result	Change
March 29, 2000	Imamura ToshiyaKansai Ki-in First Place Tournament Round 1　as Black	Loss	↓5
January 1, 1999	Hotta YozoKansai Ki-in First Place Tournament Round 1　as Black	Loss	↓21
November 12, 1997	Imai KazuhiroHoninbo Preliminary　as Black	Loss	↓19
December 3, 1992	Ohira ShuzoKisei 9 dan Section　as Black	Win	↑27
November 14, 1991	Sekiyama ToshioKansai Ki-in First Place Tournament Round 2　as Black	Loss	↓13
November 5, 1991	Sekiyama ToshioKansai Ki-in First Place Tournament Round 1　as White	Loss	↓14
March 31, 1988	Yamashiro HiroshiJudan 3rd Preliminary Final　as White	Loss	↓8
March 10, 1988	Su KaisekiJudan 3rd Preliminary　as White	Win	↑15
January 23, 1988	Ishii KunioTengen Round 1　as Black	Loss	↓11
May 28, 1987	Cho ChikunTengen Round 2　as Black	Loss	↓2
March 16, 1987	Miyazawa GoroNHK Cup Round 1　as White	Loss	↓8
March 5, 1987	Tsuchida MasamitsuTengen Round 1　as White	Win	↑14
February 19, 1987	Sakata EioGosei Round 1　as Black	Loss	↓5
December 18, 1986	Ishida YoshioKisei 9 dan Section　as White	Loss	↓7
January 16, 1986	Tsuchida MasamitsuKisei 9 dan Section　as Black	Win	↑15
January 1, 1986	O RisseiNHK Cup Round 1　as Black	Loss	↓7
April 25, 1985	Yamashiro HiroshiJudan 3rd Preliminary　as Black	Loss	↓7
April 11, 1985	Awaji ShuzoKisei 9 dan Section　as Black	Loss	↓7
March 7, 1985	Ohira ShuzoKisei 9 dan Section　as White	Win	↑27
February 28, 1985	Kamimura KunioTengen Round 1　as White	Loss	↓12

Head-to-head

Up to 10 opponents, most-played first. Records are from Koyama Yasuo's point of view; jigo and no-result games are not counted as wins or losses. Only games from 1927 onward are included.
Opponent	Total	As Black	As White
Tsuchida Masamitsu	3-1.750	2-1	1-0
Hashimoto Utaro	1-3.250	1-1	0-2
Sugiuchi Masao	0-4.000	0-3	0-1
Sakata Eio	0-3.000	0-2	0-1
Ohira Shuzo	3-01.000	2-0	1-0
Fujisawa Hosai	0-3.000	0-1	0-2
Yamabe Toshiro	0-2.000	0-1	0-1
Iwamoto Kaoru	1-1.500	1-1	0-0
Takemiya Masaki	1-1.500	0-1	1-0
Sekiyama Toshio	0-2.000	0-1	0-1

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.

Year	Record	Win rate
2000	0-1	.000
1999	0-1	.000
1997	0-1	.000
1992	1-0	1.000
1991	0-2	.000
1988	1-2	.333
1987	1-3	.250
1986	1-2	.333
1985	2-3	.400
1984	2-3	.400
1983	1-2	.333
1982	3-3	.500
1981	1-1	.500
1980	0-2	.000
1979	2-2	.500
1978	0-1	.000
1976	1-0	1.000
1974	0-2	.000
1972	0-2	.000
1971	1-3	.250
1970	3-2	.600
1969	0-2	.000
1968	0-1	.000
1967	0-2	.000
1966	3-1	.750
1965	0-5	.000
1962	0-1	.000
1961	2-2	.500
Total	25-52	.325

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