Inagaki Koichi
Inagaki Koichi (稲垣弘一) has a rating of 1493.
Retired. The rating shown is the rating at retirement.
Inagaki Koichi稲垣弘一Nihon Ki-in
Rating1493
Rank—
1-year change—
Peak rating—
Last 10LossWinLossLossWinLossLossWinLossLoss45-73
- 1996 record
- 0-1
- Record since 1927
- 45-73
- Win rate
- .381
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 |
|---|---|---|---|
| December 2, 1996 | Cho SonjinRyusei as Black | Loss | ↓7 |
| March 10, 1994 | Ogata MasakiOkan Round 2 as Black | Loss | ↓7 |
| January 27, 1994 | Hikosaka NaotoOkan Round 1 as White | Win | ↑24 |
| December 24, 1992 | Baba ShigeruOkan Round 1 as White | Loss | ↓17 |
| November 22, 1990 | Tsuchida MasamitsuOkan Round 1 as Black | Loss | ↓14 |
| January 11, 1990 | Nakano HironariHoninbo 2nd Preliminary as White | Win | ↑18 |
| June 15, 1989 | Oyama KunioHoninbo 3rd Preliminary as Black | Loss | ↓16 |
| April 20, 1989 | Iwata TatsuakiOkan Round 2 as Black | Loss | ↓10 |
| December 22, 1988 | Ito MakotoOkan Round 1 as Black | Win | ↑13 |
| October 27, 1988 | Ogata MasakiOkan Round 4 as White | Loss | ↓8 |
| August 18, 1988 | Ito YojiOkan Round 3 as White | Win | ↑17 |
| June 2, 1988 | Tsuchida MasamitsuOkan Round 2 as Black | Win | ↑20 |
| February 4, 1988 | Hamanaka TakamitsuOkan Round 1 as White | Win | ↑18 |
| October 1, 1987 | Hane YasumasaOza 2nd Preliminary as White | Loss | ↓6 |
| February 26, 1987 | Iwata TatsuakiOkan Round 2 as White | Loss | ↓6 |
| January 8, 1987 | Okumura HideoOkan Round 1 as Black | Win | ↑20 |
| December 11, 1986 | Fujisawa ShukoOza 3rd Preliminary as Black | Loss | ↓6 |
| August 7, 1986 | Kusaka KaneoOza 2nd Preliminary as Black | Win | ↑14 |
| April 10, 1986 | Ishida YoshioJudan 3rd Preliminary as White | Loss | ↓4 |
| March 27, 1986 | Nakano HironariOkan Round 2 as Black | Loss | ↓14 |
Head-to-head
| Opponent | Total | As Black | As White |
|---|---|---|---|
| Hane Yasumasa | 0-8.000 | 0-3 | 0-5 |
| Tsuchida Masamitsu | 3-4.429 | 1-3 | 2-1 |
| Saijo Masataka | 3-3.500 | 2-3 | 1-0 |
| Ishii Kunio | 1-4.200 | 0-2 | 1-2 |
| Iwata Tatsuaki | 0-4.000 | 0-3 | 0-1 |
| Hiroe Katsuhiko | 4-01.000 | 3-0 | 1-0 |
| Komatsu Nobuaki | 2-1.667 | 1-0 | 1-1 |
| Tsujii Ryotaro | 3-01.000 | 3-0 | 0-0 |
| Sakai Michiharu | 0-3.000 | 0-3 | 0-0 |
| Sumino Tsunehiro | 2-1.667 | 2-1 | 0-0 |
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.
| Year | Record | Win rate |
|---|---|---|
| 1996 | 0-1 | .000 |
| 1994 | 1-1 | .500 |
| 1992 | 0-1 | .000 |
| 1990 | 1-1 | .500 |
| 1989 | 0-2 | .000 |
| 1988 | 4-1 | .800 |
| 1987 | 1-2 | .333 |
| 1986 | 1-3 | .250 |
| 1985 | 0-1 | .000 |
| 1984 | 1-0 | 1.000 |
| 1983 | 1-1 | .500 |
| 1982 | 1-1 | .500 |
| 1981 | 0-2 | .000 |
| 1980 | 1-4 | .200 |
| 1979 | 1-2 | .333 |
| 1978 | 1-3 | .250 |
| 1977 | 0-2 | .000 |
| 1976 | 1-1 | .500 |
| 1975 | 0-6 | .000 |
| 1974 | 9-6 | .600 |
| 1973 | 6-6 | .500 |
| 1972 | 4-6 | .400 |
| 1971 | 6-6 | .500 |
| 1970 | 1-3 | .250 |
| 1969 | 3-2 | .600 |
| 1967 | 1-2 | .333 |
| 1966 | 0-1 | .000 |
| 1965 | 0-2 | .000 |
| 1963 | 0-1 | .000 |
| 1962 | 0-1 | .000 |
| 1960 | 0-2 | .000 |
| Total | 45-73 | .381 |
Calculated from games played between 1927 and 2026 (as of September 17, 2026).