With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: In informal games, the piece colors are allocated to players by the organizers; in competitive games, the colors are usually decided randomly, for example by a coin toss, or by one player concealing a white pawn in one hand and a black pawn in the other, and having the opponent choose. White moves first, after which players alternate turns, moving one piece per turn (except for castling, when two pieces are moved). A piece is moved to either an unoccupied square or one occupied by an opponent's piece, which is captured and removed from play. With the sole exception of "en passant", all pieces capture by moving to the square that the opponent's piece occupies. Moving is compulsory; a player may not skip a turn, even when having to move is detrimental.
text_B: Are competitive chess referees likely trained to carry a coin with them at all times while performing their job?
YES.