He is a former Kisei title holder and became the first active Class A professional to lose to a computer when he lost to the GPS Shogi program in April 2013.

[3] In October 1998, Miura won the 29th Shinjin-Ō [ja]—a tournament for players ranked 6-dan or lower who are 26-years-old or younger—by defeating Naruyuki Hatakeyama 2 games to 0.

[9] Miura became the first active Class A professional to lose an officially sanctioned game to a computer when he was defeated by GPS Shogi in April 2013.

[14] A few days before the match against Watanabe was scheduled to begin, the Japan Shogi Association (JSA) announced that Maruyama would be replacing Miura as the challenger.

[15][16] An independent investigative panel was established at the end of October 2016 to determine whether Miura had actually done anything wrong and to evaluate the appropriateness of the JSA's response to the allegations.

[17][18] The panel announced its findings at the end of December 2016, stating that it found insufficient evidence to support the accusations made against Miura and that the claim that he had excessively left his seat during official games was false.

[21] In May 2017, Miura and new JSA president Yasumitsu Satō held a joint press conference to announce that a settlement had been reached to resolve any outstanding issues between the two sides.

It was also announced that the JSA agreed to pay Miura an undisclosed financial settlement to compensate him for not only lost game fees but also for the mental anguish and damage caused to his reputation.