CREATE TABLE table_name_56 (method VARCHAR, res VARCHAR, opponent VARCHAR)

What method was used that had a resulting win against opponent, Natsuko Kikukawa?
SELECT method FROM table_name_56 WHERE res = "win" AND opponent = "natsuko kikukawa"
SELECT "method" FROM "table_name_56" WHERE "natsuko kikukawa" = "opponent" AND "res" = "win"