CREATE TABLE table_23982399_12 (challenger VARCHAR, winner VARCHAR)
SELECT challenger FROM table_23982399_12 WHERE winner = "Kimio Nonaga"
ใครคือผู้ท้าชิงเมื่อผู้ชนะคือ คิมิโอะ โนนากะ?
Who was the challenger when winner was kimio nonaga?