ตั้งชื่อทีมเดียวที่พวกเขามีสถิติแพ้ ไม่จำเป็นต้องใช้ตารางทั้งหมด
name the only team they had a losing record against .It is not neccessary to use all the tables.
 table_203_506:  id [ number]  "opponent" [ text]  "played" [ number]  "won" [ number]  "lost" [ number]  "drawn" [ number] 
SELECT "opponent" FROM table_203_506 ORDER BY "lost" DESC LIMIT 1