| http://www.w3.org/ns/prov#value | - t, bishop or queen of the respective colour, independently of the pieces taken prior to the promotion.Pawns may only change the file they move in by taking pieces.A pawn cannot reach the opposing rank (8 for white, 1 for black) if the opponent's pawn in the file it is moving in is not taken.The two kings must not stand next to each other.During play, all pieces except for the two kings may be taken
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