With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Beyoncé Knowles was listed by Time as sixth place for Person of the Year.
text_B: In chess , checkmates in the opening are examples of a player being checkmated during the first few moves of the game -LRB- i.e. in the opening -RRB- .. chess. chess. opening. chess opening. Some common or notable mating patterns have names of their own .. These include Fool 's mate , Scholar 's mate , and Legal 's mate .
not_related.