คู่ต่อสู้ของอานันท์คือใครในแมตช์ด้วย 20 กระบวนท่าที่เปิดด้วย E15 Queen's Indian Defence?
Who was the opponent of Anand in the match with 20 moves that opened with E15 Queen's Indian Defence?
df = pd.DataFrame(columns=['black', 'opening', 'white', 'moves'])
df[(df['white'] == 'anand') & (df['moves'] == '20') & (df['opening'] == 'e15 queen\'s indian defence')]['black']