Isogawa Masao
Isogawa Masao (磯川正夫) has a rating of 1539.
Isogawa Masao磯川正夫
Rating1539
Rank—
1-year change—
Peak rating—
Last 10LossLossLossWinLossWinWinWinWinLoss74-76
- 1972 record
- 3-1
- Record since 1927
- 74-76(2 no result)
- Win rate
- .493
Not listed in the rating list: we have not confirmed whether this player is active
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 |
|---|---|---|---|
| February 17, 1972 | Kusaka KaneoFormer Meijin 2nd Preliminary as White | Loss | ↓21 |
| February 3, 1972 | Hisai KeishiNihon Ki-in Championship 2nd Preliminary as White | Win | ↑19 |
| January 27, 1972 | Tsuchida MasamitsuFormer Meijin 2nd Preliminary as Black | Win | ↑18 |
| January 20, 1972 | Tsujii RyotaroNihon Ki-in Championship 2nd Preliminary as Black | Win | ↑10 |
| December 16, 1971 | Nabeshima AkiraNihon Ki-in Championship 2nd Preliminary as White | Win | ↑10 |
| November 4, 1971 | Hashimoto YoshimiOza 2nd Preliminary as White | Loss | ↓9 |
| September 23, 1971 | Ozaki HarumiOza 2nd Preliminary as Black | Win | ↑9 |
| August 26, 1971 | Fujisawa HosaiAll-Japan First Place Tournament Final Preliminary as Black | Loss | ↓6 |
| August 19, 1971 | Kato MasaoFormer Meijin Final Preliminary as Black | Loss | ↓5 |
| August 12, 1971 | Sometani KazuoJudan 2nd Preliminary as White | Loss | ↓14 |
| July 22, 1971 | Segawa YoshioJudan 2nd Preliminary as White | Win | ↑15 |
| July 8, 1971 | Kano YoshinoriFormer Meijin 3rd Preliminary as White | Win | ↑18 |
| May 6, 1971 | Morishima KaoruHoninbo 2nd Preliminary as White | Loss | ↓22 |
| April 29, 1971 | Sakai MichiharuAll-Japan First Place Tournament Preliminary as White | Win | ↑20 |
| April 1, 1971 | Hiroe KatsuhikoAll-Japan First Place Tournament Preliminary as Black | Win | ↑14 |
| March 25, 1971 | Ito TomoeFormer Meijin 2nd Preliminary as White | Win | ↑10 |
| March 11, 1971 | Sakai ToshioPro Best Ten 2nd Preliminary as Black | Loss | ↓25 |
| January 28, 1971 | Amayake NobuoFormer Meijin 2nd Preliminary as White | Win | ↑13 |
| January 14, 1971 | Kusaka KaneoFormer Meijin 2nd Preliminary as Black | Win | ↑17 |
| December 17, 1970 | Tsuchida MasamitsuNihon Ki-in Championship 2nd Preliminary as Black | Loss | ↓12 |
Head-to-head
| Opponent | Total | As Black | As White |
|---|---|---|---|
| Hashimoto Yoshimi | 2-7.222 | 1-0 | 1-7 |
| Hane Yasumasa | 2-8.200 | 1-3 | 1-5 |
| Kusaka Kaneo | 4-4.500 | 2-1 | 2-3 |
| Sometani Kazuo | 2-4.333 | 2-3 | 0-1 |
| Nabeshima Ichiro | 3-2.600 | 1-0 | 2-2 |
| Izutani Minoru | 2-3.400 | 2-2 | 0-1 |
| Sumino Tsunehiro | 3-2.600 | 2-1 | 1-1 |
| Ishii Kunio | 2-3.400 | 1-1 | 1-2 |
| Otake Hideo | 2-3.400 | 1-1 | 1-2 |
| Segawa Yoshio | 1-3.250 | 0-1 | 1-2 |
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 |
|---|---|---|
| 1972 | 3-1 | .750 |
| 1971 | 9-6 | .600 |
| 1970 | 7-8 | .467 |
| 1969 | 4-4 | .500 |
| 1968 | 2-7 | .222 |
| 1967 | 3-8 | .273 |
| 1966 | 8-7 | .533 |
| 1965 | 8-5 | .615 |
| 1964 | 5-9 | .357 |
| 1963 | 12-7(2 no result) | .632 |
| 1962 | 9-4 | .692 |
| 1961 | 4-4 | .500 |
| 1960 | 0-6 | .000 |
| Total | 74-76(2 no result) | .493 |
Calculated from games played between 1927 and 2026 (as of September 17, 2026).