คะแนนของ Yardley-BRM สูงสุดหลังปี 1971 คืออะไร?
What was Yardley-BRM's points high after 1971?
df = pd.DataFrame(columns=['points', 'entrant', 'year'])
df.loc[(df['entrant'] == 'Yardley-BRM') & (df['year'] > 1971), 'points'].max()