Iwata Tatsuaki
Iwata Tatsuaki (岩田達明) has a rating of 1612. Their highest rating so far is 1740 (September 21, 2006).
Retired. The rating shown is the rating at retirement.
Iwata Tatsuaki岩田達明Nihon Ki-in
Rating1612
Rank—
1-year change—
Peak rating1740
Last 10WinLossWinLossLossLossWinLossLossLoss344-324(1 by default)
- 2012 record
- 5-8
- Record since 1927
- 344-324
- Win rate
- .515
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
Rating history — professional
The “All” view starts at 2006; earlier years are used only to warm up the calculation and are not shown.
Recent games
| Date | Opponent and tournament | Result | Change |
|---|---|---|---|
| November 10, 2012 | Hiroe HiroyukiMeijin Colors unknown | Loss | ↓17 |
| July 7, 2012 | Ogata MasakiGosei Colors unknown | Loss | ↓9 |
| May 19, 2012 | Ishii KunioOza Colors unknown | Loss | ↓18 |
| April 14, 2012 | Akedo KazumiGosei Colors unknown | Win | ↑4 |
| March 17, 2012 | Yamada KimioHoninbo Colors unknown | Loss | ↓7 |
| March 10, 2012 | Tsuruta KazushiTengen Colors unknown | Loss | ↓25 |
| March 3, 2012 | Ishida AtsushiJudan Colors unknown | Loss | ↓21 |
| February 24, 2012 | Takabayashi MasahiroGosei Colors unknown | Win | ↑9 |
| February 17, 2012 | Miyagawa FumihikoMeijin Colors unknown | Loss | ↓21 |
| February 3, 2012 | Nakao JungoHoninbo Colors unknown | Win | ↑11 |
| January 21, 2012 | Ishida AtsushiJudan Colors unknown | Loss | ↓24 |
| January 20, 2012 | O KeiiMeijin Colors unknown | Win | ↑7 |
| January 6, 2012 | Takagi JunpeiGosei Colors unknown | Win | ↑8 |
| December 23, 2011 | Kumamoto ShuseiJudan Colors unknown | Win | ↑10 |
| November 26, 2011 | Ohashi NaruyaJudan Colors unknown | Win | ↑10 |
| November 4, 2011 | Shida TatsuyaOza Colors unknown | Loss | ↓12 |
| August 12, 2011 | Baba ShigeruOza Colors unknown | Win | ↑11 |
| August 6, 2011 | Ito YojiJudan Colors unknown | Win | ↑10 |
| January 14, 2011 | Sakaguchi RyuzoMeijin Colors unknown | Loss | ↓21 |
| March 11, 2010 | Nakano HironariHoninbo Colors unknown | Loss | ↓12 |
Head-to-head
| Opponent | Total | As Black | As White |
|---|---|---|---|
| Hane Yasumasa | 12-14.462 | 7-5 | 5-8 |
| Sakata Eio | 7-12.368 | 3-5 | 4-7 |
| Yamashiro Hiroshi | 4-11.267 | 1-2 | 2-6 |
| Takemiya Masaki | 4-10.286 | 1-5 | 3-5 |
| Otake Hideo | 2-12.143 | 1-4 | 1-8 |
| Miyashita Shuyo | 3-11.214 | 1-6 | 2-5 |
| Fujisawa Hosai | 5-8.385 | 1-4 | 4-4 |
| Sugiuchi Masao | 4-9.308 | 3-4 | 1-5 |
| Rin Kaiho | 2-10.167 | 0-5 | 2-5 |
| Shimamura Toshihiro | 3-9.250 | 1-4 | 2-5 |
| Fujisawa Shuko | 5-6.455 | 5-5 | 0-1 |
| Hashimoto Utaro | 4-7.364 | 4-6 | 0-1 |
| Takagawa Shukaku | 6-5.545 | 4-1 | 2-4 |
| Kobayashi Koichi | 2-8.200 | 1-6 | 1-2 |
| Hashimoto Shoji | 3-7.300 | 0-4 | 3-3 |
| Kudo Norio | 4-5.444 | 4-1 | 0-3 |
| Hashimoto Yoshimi | 5-4.556 | 2-1 | 3-3 |
| Kuwata Yasuaki | 8-1.889 | 4-1 | 2-0 |
| Ishida Yoshio | 3-6.333 | 1-5 | 2-1 |
| Takagi Shoichi | 5-4.556 | 3-1 | 2-3 |
| Kato Masao | 3-5.375 | 2-3 | 1-2 |
| Ohira Shuzo | 2-6.250 | 2-4 | 0-2 |
| Ogata Masaki | 3-5.375 | 2-1 | 0-1 |
| Magari Reiki | 5-2.714 | 3-1 | 1-1 |
| Yamabe Toshiro | 1-6.143 | 1-5 | 0-1 |
| Sakai Michiharu | 6-1.857 | 3-0 | 3-1 |
| Tsuchida Masamitsu | 7-01.000 | 3-0 | 3-0 |
| Katayama Yasuo | 6-1.857 | 0-0 | 0-0 |
| Cho Chikun | 3-4.429 | 2-2 | 1-2 |
| Segawa Yoshio | 5-1.833 | 2-1 | 3-0 |
| Kano Yoshinori | 5-1.833 | 3-0 | 2-1 |
| Awaji Shuzo | 2-4.333 | 1-4 | 1-0 |
| Kajiwara Takeo | 3-3.500 | 2-2 | 1-1 |
| Hisai Keishi | 5-1.833 | 2-1 | 3-0 |
| Ishii Kunio | 3-3.500 | 0-0 | 2-2 |
| Hikosaka Naoto | 1-5.167 | 1-0 | 0-1 |
| Sakai Takeshi | 3-3.500 | 2-1 | 1-2 |
| Nakane Naoyuki | 2-3.400 | 0-0 | 0-0 |
| Yoshida Yoichi | 3-2.600 | 3-1 | 0-1 |
| Kusaka Kaneo | 3-2.600 | 1-1 | 2-1 |
| Imamura Yoshiaki | 0-5.000 | 0-1 | 0-1 |
| Tono Hiroaki | 1-4.200 | 1-1 | 0-3 |
| Komatsu Hideki | 1-4.200 | 1-0 | 0-4 |
| Saijo Masataka | 4-1.800 | 3-0 | 1-0 |
| Sakaguchi Ryuzo | 3-2.600 | 0-0 | 0-0 |
| Kada Katsuji | 3-2.600 | 0-1 | 3-1 |
| Maeda Nobuaki | 4-1.800 | 0-0 | 4-1 |
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 |
|---|---|---|
| 2012 | 5-8 | .385 |
| 2011 | 4-2 | .667 |
| 2010 | 1-1 | .500 |
| 2008 | 0-1 | .000 |
| 2007 | 0-1 | .000 |
| 2006 | 12-6 | .667 |
| 2005 | 12-10 | .545 |
| 2004 | 13-9 | .591 |
| 2003 | 6-9 | .400 |
| 2002 | 8-8 | .500 |
| 2001 | 0-1 | .000 |
| 1998 | 1-2 | .333 |
| 1997 | 3-1 | .750 |
| 1996 | 1-1 | .500 |
| 1995 | 1-4 | .200 |
| 1994 | 1-2 | .333 |
| 1993 | 2-5 | .286 |
| 1992 | 3-8 | .273 |
| 1991 | 6-6 | .500 |
| 1990 | 2-1 | .667 |
| 1989 | 5-5 | .500 |
| 1988 | 2-6 | .250 |
| 1987 | 5-7 | .417 |
| 1986 | 7-6 | .538 |
| 1985 | 11-11 | .500 |
| 1984 | 9-13 | .409 |
| 1983 | 14-11 | .560 |
| 1982 | 13-11 | .542 |
| 1981 | 11-6 | .647 |
| 1980 | 4-7 | .364 |
| 1979 | 9-7 | .563 |
| 1978 | 5-6 | .455 |
| 1977 | 4-5 | .444 |
| 1976 | 2-8 | .200 |
| 1975 | 3-8 | .273 |
| 1974 | 6-6 | .500 |
| 1973 | 14-7 | .667 |
| 1972 | 14-9 | .609 |
| 1971 | 11-6 | .647 |
| 1970 | 15-10 | .600 |
| 1969 | 8-8 | .500 |
| 1968 | 9-4 | .692 |
| 1967 | 8-6 | .571 |
| 1966 | 9-9 | .500 |
| 1965 | 13-8 | .619 |
| 1964 | 13-9 | .591 |
| 1963 | 13-11 | .542 |
| 1962 | 9-10 | .474 |
| 1961 | 8-7 | .533 |
| 1960 | 7-5 | .583 |
| 1955 | 2-6 | .250 |
| Total | 344-324 | .515 |
Calculated from games played between 1927 and 2026 (as of September 17, 2026).