With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: TD Garden has hosted Boston Celtics games.
text_B: The 1866 Open Championship was the seventh Open Championship and was held on 13 September at Prestwick Golf Club .. Prestwick Golf Club. Prestwick Golf Club. Open Championship. Open Championship. Willie Park , Sr. won the championship for the third time , by two shots from his brother Davie Park .. Davie Park. Davie Park. There were 16 competitors .. Played in a strong wind Willie Park was in the first group out and set the pace with a score of 54 .. Defending champion , Andrew Strath and Davie Park were four behind , scoring 58 .. Davie Park. Davie Park. Andrew Strath. Andrew Strath. Willie Park extended his lead to five stokes after the second round .. Despite a final round of 59 Willie Park set a useful target of 169 .. Davie Park 's final round of 56 gave him a total of 171 and second place .. Davie Park. Davie Park. Robert Andrew was third , a further five strokes behind .. Robert Andrew. Robert Andrew ( golfer )
not_related.