Both pros and amateurs participated, but no amateurs reached the main tournament. There was one amateur from Europe: Hans Pietsch, and one from America: Thomas Tu.
The two preliminaries were played on 1988-06-06 and 1988-06-20 (two games on each day).
The top ten Nihon Ki-in players (ranked by prime money in the preceding year) were seeded, but Sakata withdrew and was replaced by Ishida.
| 1st IBM Hayago Open | ||||||
|---|---|---|---|---|---|---|
| Takabayashi Masahiro (5p) | Takabayashi Masahiro | Takemiya Masaki | Takemiya Masaki | Takemiya Masaki B+R 1988-07-18 |
Takemiya Masaki B+1.5 1988-10-04 |
Ishida Yoshio W+0.5 1988-10-04 |
| Kobayashi Satoru (9p) | ||||||
| Takemiya Masaki (9p) | Takemiya Masaki | |||||
| Narusawa Yasuichi (6p) | ||||||
| Hikosaka Naoto (7p) | Sonoda Yuichi | Nishimura Keiji B+2.5 1988-06-25 |
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| Sonoda Yuichi (9p) | ||||||
| Ezura Yuichi (7p) | Nishimura Keiji | |||||
| Nishimura Keiji (4p) | ||||||
| Ishige Kakuo (7p) | Chen Linxin | Chen Linxin | Takagi Shoichi | |||
| Chen Linxin (8p) | ||||||
| Haruyama Isamu (9p) | Minami Yoshimi | |||||
| Minami Yoshimi (9p) | ||||||
| Kiyonari Tetsuya (9p) | Kiyonari Tetsuya | Takagi Shoichi | ||||
| Ogaki Yusaku (3p) | ||||||
| Takagi Shoichi (9p) | Takagi Shoichi | |||||
| Imamura Yoshiaki (5p) | ||||||
| Enda Hideki (5p) | Enda Hideki | O Rissei | O Rissei | O Rissei W+R 1988-07-18 |
||
| Inoue Kunio (8p) | ||||||
| O Rissei (8p/9p) | O Rissei | |||||
| Kanashima Tadashi (8p) | ||||||
| Imamura Toshiya (8p) | Komatsu Hideki | Komatsu Hideki B+R 1988-06-25 |
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| Komatsu Hideki (6p) | ||||||
| Lee Changho (2p) | Lee Changho B+R 1988-06-25 |
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| Suzuki Masaharu (6p) | ||||||
| Kataoka Satoshi (8p) | Kataoka Satoshi | Ogata Masaki | Ogata Masaki | |||
| Otake Hideo (9p) | ||||||
| O Meien (8p) | Ogata Masaki | |||||
| Ogata Masaki (7p) | ||||||
| Ishii Shinzo (9p) | Ishii Shinzo | Ishii Shinzo | ||||
| Hashimoto Yujiro (6p) | ||||||
| Ohira Shuzo (9p) | Ohira Shuzo | |||||
| Cho Sonjin (5p) | ||||||
| Goto Shungo (6p) | Oya Koichi | Yamashiro Hiroshi | Hidaka Toshiyuki | Oyama Kunio B+R 1988-07-18 |
Ishida Yoshio B+R 1988-10-04 |
|
| Oya Koichi (6p) | ||||||
| Abe Yoshiteru (9p) | Yamashiro Hiroshi W+2.5 1988-06-25 |
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| Yamashiro Hiroshi (9p) | ||||||
| Saijo Masataka (8p) | Hidaka Toshiyuki | Hidaka Toshiyuki | ||||
| Hidaka Toshiyuki (6p) | ||||||
| Shiraishi Yutaka (9p) | Shiraishi Yutaka | |||||
| Izumitani Masanori (6p) | ||||||
| Kudo Norio (9p) | Kudo Norio B+3.5 1988-06-25 |
Kudo Norio | Oyama Kunio B+4.5 1988-07-18 |
|||
| Yang Hui (7p) | ||||||
| Izumitani Hideo (3p) | Sakaguchi Ryuzo | |||||
| Sakaguchi Ryuzo (9p) | ||||||
| Oyama Kunio (9p) | Oyama Kunio | Oyama Kunio | ||||
| Nakamura Hidehito (9p) | ||||||
| Ishida Akira (9p) | Sanno Hirotaka | |||||
| Sanno Hirotaka (9p) | ||||||
| Kojima Takaho (9p) | Miyamoto Yoshihisa | Fujisawa Shuko B+7.5 1988-06-25 |
Ishida Yoshio W+0.5 1988-07-21 |
Ishida Yoshio W+11.5 1988-07-21 |
||
| Miyamoto Yoshihisa (9p) | ||||||
| Iwata Tatsuaki (9p) | Fujisawa Shuko W+R 1988-06-25 |
|||||
| Fujisawa Shuko (9p) | ||||||
| Hashimoto Shoji (9p) | Hashimoto Shoji | Ishida Yoshio | ||||
| Miyazawa Goro (8p) | ||||||
| Ishida Yoshio (9p) | Ishida Yoshio | |||||
| Onda Yasuhiko (5p) | ||||||
| Seo Nungwuk (8p) | Seo Nungwuk W+R 1988-06-25 |
Seo Nungwuk B+R 1988-06-25 |
Seo Nungwuk W+R 1988-07-21 |
|||
| Ono Nobuyuki (5p) | ||||||
| Kori Toshio (7p) | Kori Toshio | |||||
| So Kofuku (5p) | ||||||
| Awaji Shuzo (9p) | Kanda Ei | Kanda Ei | ||||
| Kanda Ei (7p) | ||||||
| Toriki Hiroshi (5p) | Toriki Hiroshi | |||||
| Hasegawa Sunao (9p) | ||||||