CREATE TABLE table_203_506 (id DECIMAL, "opponent" TEXT, "played" DECIMAL, "won" DECIMAL, "lost" DECIMAL, "drawn" DECIMAL, "% won overall" TEXT)

teams where the number of games played was the same as number of games won .
SELECT "opponent" FROM table_203_506 WHERE "played" = "won"
SELECT "opponent" FROM "table_203_506" WHERE "played" = "won"