[4] He is also one of the 'Six Supers' Japanese players that were most celebrated in the late twentieth century, along with Rin Kaiho, Otake Hideo, Takemiya Masaki, Kato Masao and his classmate and arch-rival Kobayashi Koichi.

He was known to be lax in his studies, which could be clearly seen when his future rival Koichi Kobayashi joined the Kitani school.

Although he had a great record of thirty wins and only six losses in this year, he lost twice to his rival Koichi Kobayashi in big tournaments—first the 4th Shin-Ei, which was even televised, and in the final of the 16th Prime Minister Cup.

After a rocky start, Cho gained momentum, beating three top players, until he lost to Rin Kaiho, who was Meijin at the time, in the 9th Asahi Pro Best Ten tournament.

His most significant accomplishment of 1974 was qualifying for the 22nd Nihon Ki-in Championship, especially since this came after being beaten out of the Honinbo preliminaries by Takaho Kojima.

He was awarded a Special Merit Prize by Kido magazine after his most impressive record thus far of 33 wins and 9 losses.

He barely lost out in the final of the 22nd Nihon Ki-In Championship to Eio Sakata after making a critical mistake that led to his resignation.

This loss fueled him to take the 12th Asahi Pro Best Ten undefeated, which made him look incredibly powerful, as all the opponents were 9-dan.

His spirits were high after he was promoted to 7 dan in late October, only to be crushed a month later when his teacher, Kitani, died.

Things started looking up after he reached the semi-final of the 20th Prime Minister Cup, only to fall after losing in the 2nd round of the 1st Shinjin-O.

Although having a not so great record in tournaments, he won prizes from Kido for having the highest number of wins (46) and for having the best technique.

There are rumors that said that Cho vowed that after moving to Japan, he wouldn't return to South Korea until the Meijin title was his.

Being up 3–0 in the Kisei final, it looked like Fujisawa Shuko would run away with the title – for a seventh time in a row.

Cho left many flabbergasted after coming back to win three games to tie it at three a piece.

For the fourth time in 5 years, Cho faced Otake Hideo in the Meijin final.

At the same time he had happiness, there was sadness as Kobayashi took the Meijin title which Cho had held for 5 years.

At around lunch time on January 6, 1986, Cho was leaving in his car when a motorcyclist came around from his blind spot.

He lucked out in the 1991 Fujitsu Cup because his opponent Qian Yuping had health issues to pay attention to and couldn't compete in the final.

[14] Cho made another miraculous comeback, this time in 1992 against his biggest rival Kobayashi Koichi in the Honinbo.

It was strange that Cho started a year without any big titles, that it even led to him being entitled the 25th Honinbo.

The record of 64 career titles was previously held by Eio Sakata, and was finally broken after 27 years.

Cho found himself in a league with old friends and rivals, including Masao Kato, Rin Kaiho, and Yoda Norimoto.

The league also included young guns Cho U, Shinji Takao, and Keigo Yamashita.

His last match of the main tournament was against Tomoyasu Mimura, of which he held white once more, and cruised past by resignation.

His opponent for the challenger final was Shinji Takao, who had beaten at then some of the top players in Japan, Masao Kato and Norimoto Yoda, on his way into the loser's section of the tournament.

Cho won the first game of the 44th Judan against the then newly crowned Kisei, Keigo Yamashita.

In the third game, Yamashita started to fight back and knocked down Cho by 8 and a half points.

[24] Cho won the first game of his second consecutive Judan defense against Keigo Yamashita by resignation.

Zen uses neural network techniques similar to AlphaGo,[30] however ran on more modest hardware during the match.

[33] Takehisa Matsumoto, who won in the final of the Shinjin-O against Ko Iso in 2006 is a pupil of Cho.