Iwata Masao
Iwata Masao (岩田正男) has a rating of 1525.
Iwata Masao岩田正男
Rating1525
Rank—
1-year change—
Peak rating—
Last 10WinLossWinJigo / no resultWinLossWinLossWinLoss16-16
- 1961 record
- 1-2
- Record since 1927
- 16-16(2 jigo)
- Win rate
- .500
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 |
|---|---|---|---|
| August 30, 1961 | Magari ReikiNihon Ki-in Championship Round 1 as White | Loss | ↓14 |
| July 12, 1961 | Kubouchi ShuchiHoninbo 3rd Preliminary Round 1 as Black | Win | ↑15 |
| February 15, 1961 | Handa DogenFormer Meijin as White | Loss | ↓15 |
| November 9, 1960 | Hashimoto ShojiJapan Strongest Player Tournament League as White | Win | ↑16 |
| October 19, 1960 | Hashimoto UtaroHoninbo 3rd Preliminary Final as White | Loss | ↓15 |
| September 14, 1960 | Hashimoto UtaroJapan Strongest Player Tournament League as Black | Win | ↑19 |
| August 31, 1960 | Go SeigenJapan Strongest Player Tournament League as Black | Jigo / no result | — |
| August 24, 1960 | Ohira ShuzoHoninbo 3rd Preliminary as Black | Win | ↑22 |
| August 10, 1960 | Sakata EioJapan Strongest Player Tournament League as White | Loss | ↓10 |
| August 3, 1960 | Seo HisashiHoninbo 3rd Preliminary as White | Win | ↑15 |
| July 27, 1960 | Kitani MinoruJapan Strongest Player Tournament League as Black | Win | ↑18 |
| May 18, 1960 | Sakata EioJapan Strongest Player Tournament League as Black | Loss | ↓10 |
| April 6, 1960 | Hashimoto UtaroJapan Strongest Player Tournament League as White | Loss | ↓14 |
| January 23, 1960 | Go SeigenJapan Strongest Player Tournament League as White | Loss | ↓17 |
| January 6, 1960 | Hashimoto ShojiJapan Strongest Player Tournament League as Black | Win | ↑16 |
| January 1, 1960 | Kitani MinoruJapan Strongest Player Tournament League as White | Jigo / no result | — |
| September 2, 1959 | Kitani MinoruJapan Strongest Player Tournament League as White | Win | — |
| August 26, 1959 | Kitani MinoruNihon Ki-in Championship Round 1 as Black | Loss | — |
| June 10, 1959 | Sakata EioJapan Strongest Player Tournament League as Black | Loss | — |
| March 29, 1959 | Takagawa ShukakuJapan Strongest Player Tournament League as Black | Win | — |
Head-to-head
| Opponent | Total | As Black | As White |
|---|---|---|---|
| Kitani Minoru | 2-2.500 | 1-2 | 1-0 |
| Hashimoto Utaro | 3-2.600 | 2-0 | 1-2 |
| Go Seigen | 0-3.000 | 0-1 | 0-2 |
| Sakata Eio | 0-4.000 | 0-2 | 0-2 |
| Hashimoto Shoji | 3-1.750 | 2-1 | 1-0 |
| Takagawa Shukaku | 1-2.333 | 1-0 | 0-2 |
| Ohira Shuzo | 2-01.000 | 1-0 | 1-0 |
| Iwamoto Kaoru | 2-01.000 | 0-0 | 2-0 |
| Handa Dogen | 1-1.500 | 0-0 | 1-1 |
| Magari Reiki | 0-1.000 | 0-0 | 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 |
|---|---|---|
| 1961 | 1-2 | .333 |
| 1960 | 6-5(2 jigo) | .545 |
| 1959 | 3-3 | .500 |
| 1958 | 3-5 | .375 |
| 1957 | 2-0 | 1.000 |
| 1954 | 1-0 | 1.000 |
| 1953 | 0-1 | .000 |
| Total | 16-16(2 jigo) | .500 |
Calculated from games played between 1927 and 2026 (as of September 17, 2026).