Kōzō Arimori

is a Japanese retired professional shogi player who achieved the rank of 8-dan.

Early life, amateur shogi and apprenticeship Arimori was born in Okayama, Okayama Prefecture on February 13, 1963. As a junior high school student he won the 2nd in 1977, and that same year was accepted into the Japan Shogi Association's apprentice school at the rank of apprentice professional 5-kyū under the tutelage of shogi professional Michio Ariyoshi.

Shogi professional In March 2007, Arimori declared his intention to the Japan Shogi Association to become a Free Class player as of April 2007.

On April 1, 2025, the announced Arimori had met the conditions for mandatory retirement for "Free Class" players and his retirement would become official upon completion of his final scheduled game of the 20252026 shogi season. Arimori's retirement became official upon losing to Yūya Saitō on May 15, 2025, in a 38th Ryūō Group 6 game. He finished his career with a record of 544 wins and 539 losses for a winning percentage of 0.502.

Promotion history The promotion history for Arimori is as follows: