สนามชิงแชมป์แห่งใดที่มีคะแนนเป็น 6×7 (4×7) , 3×6?
What are the championship venues where the score was 6–7 (4–7) , 3–6?
df = pd.DataFrame(columns=['championship', 'score'])
df[df['score'] == '6–7 (4–7) , 3–6']['championship']