Yokoyama Koichi
Yokoyama Koichi (横山孝一) has a rating of 1286.
Retired. The rating shown is the rating at retirement.
Yokoyama Koichi横山孝一Nihon Ki-in
Rating1286
Rank—
1-year change—
Peak rating—
Last 10LossWinLossLossLossLossLossLossLossLoss35-78
- 1997 record
- 0-1
- Record since 1927
- 35-78
- Win rate
- .310
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 ratingsFind a player
Recent games
| Date | Opponent and tournament | Result | Change |
|---|---|---|---|
| October 27, 1997 | Nobuta ShigehitoRyusei as Black | Loss | ↓10 |
| February 13, 1992 | Kataoka SatoshiMeijin 2nd Preliminary as Black | Loss | ↓1 |
| August 17, 1989 | Ohira ShuzoJudan 2nd Preliminary as Black | Loss | ↓2 |
| April 2, 1987 | Ezura YuichiJudan 3rd Preliminary as Black | Loss | ↓9 |
| June 21, 1984 | Ohira ShuzoGosei Preliminary as White | Loss | ↓2 |
| October 22, 1981 | Takagawa KakuTengen 2nd Preliminary as White | Loss | ↓3 |
| September 11, 1980 | Sakata EioOza 2nd Preliminary as Black | Loss | ↓1 |
| April 10, 1980 | Takagi ShoichiJudan 3rd Preliminary Final as White | Loss | ↓3 |
| March 20, 1980 | Oyama KunioJudan 3rd Preliminary as Black | Win | ↑24 |
| April 12, 1979 | Ohira ShuzoMeijin 2nd Preliminary as White | Loss | ↓2 |
| December 21, 1978 | Nakamura HidehitoPrime Minister's Cup Round 2 as Black | Loss | ↓5 |
| December 6, 1978 | Hisajima KunioPrime Minister's Cup Round 1 as White | Win | ↑22 |
| November 30, 1978 | Kudo NorioTengen 2nd Preliminary as Black | Loss | ↓1 |
| December 21, 1977 | Asano HideakiPrime Minister's Cup Round 1 as White | Loss | ↓9 |
| December 15, 1977 | Okubo IchigenOza 3rd Preliminary as Black | Loss | ↓5 |
| October 20, 1977 | Sakata EioOza 2nd Preliminary as Black | Win | ↑31 |
| October 20, 1976 | Oka NobumitsuPrime Minister's Cup as Black | Loss | ↓17 |
| January 7, 1976 | Shirae HaruhikoPrime Minister's Cup Round 1 as Black | Loss | ↓15 |
| December 10, 1975 | Kanashima TadashiJudan 2nd Preliminary as Black | Loss | ↓8 |
| September 10, 1975 | Fukui SusumuTengen 2nd Preliminary as Black | Loss | ↓7 |
Head-to-head
| Opponent | Total | As Black | As White |
|---|---|---|---|
| Haruyama Isamu | 1-4.200 | 1-2 | 0-2 |
| Suzuki Masaharu | 3-2.600 | 3-0 | 0-2 |
| Kudo Norio | 1-3.250 | 1-1 | 0-2 |
| Kaji Kazutame | 1-3.250 | 0-2 | 1-1 |
| Kanno Kiyonori | 1-3.250 | 0-2 | 1-1 |
| Takeda Hakuai | 3-1.750 | 1-1 | 2-0 |
| Kitamura Hiroshi | 2-2.500 | 0-0 | 2-2 |
| Ohira Shuzo | 0-3.000 | 0-1 | 0-2 |
| Ando Takeo | 2-1.667 | 1-0 | 1-1 |
| Kojima Takaho | 0-3.000 | 0-2 | 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 |
|---|---|---|
| 1997 | 0-1 | .000 |
| 1992 | 0-1 | .000 |
| 1989 | 0-1 | .000 |
| 1987 | 0-1 | .000 |
| 1984 | 0-1 | .000 |
| 1981 | 0-1 | .000 |
| 1980 | 1-2 | .333 |
| 1979 | 0-1 | .000 |
| 1978 | 1-2 | .333 |
| 1977 | 1-2 | .333 |
| 1976 | 0-2 | .000 |
| 1975 | 3-5 | .375 |
| 1974 | 0-7 | .000 |
| 1973 | 2-6 | .250 |
| 1972 | 1-8 | .111 |
| 1971 | 7-8 | .467 |
| 1970 | 6-6 | .500 |
| 1969 | 4-6 | .400 |
| 1968 | 3-8 | .273 |
| 1967 | 2-5 | .286 |
| 1966 | 0-1 | .000 |
| 1961 | 1-1 | .500 |
| 1960 | 3-2 | .600 |
| Total | 35-78 | .310 |
Calculated from games played between 1927 and 2026 (as of September 17, 2026).