CREATE TABLE table_name_97 (location VARCHAR, method VARCHAR, opponent VARCHAR)

Which location has a method of decision and Nikos Tsoukalas for an opponent?
SELECT location FROM table_name_97 WHERE method = "decision" AND opponent = "nikos tsoukalas"
SELECT "location" FROM "table_name_97" WHERE "decision" = "method" AND "nikos tsoukalas" = "opponent"