ทัวร์นาเมนต์ใดที่มี Kramnik สีดำและการเปิด B66 Sicilian Defence?
What tournament had a black of Kramnik and an opening of B66 Sicilian Defence?
df = pd.DataFrame(columns=['tournament', 'black', 'opening'])
df[(df['black'] == 'kramnik') & (df['opening'] == 'b66 sicilian defence')]['tournament']