Pin (chess) Pin (chess) In chess, a pin is a situation brought on by an attacking piece in which a defending piece cannot move without exposing a more valuable defending piece on its other side to capture by the attacking piece. Moving the attacking piece to bring on the pin is called pinning; the defending piece so restricted is described as pinned. Only pieces that can move an indefinite number of squares in a horizontal, vertical, or diagonal line (i.e. bishops, rooks, and queens) can pin. Kings, knights, and pawns cannot pin. Any piece can be pinned except the king, since the
History of chess by the common public, and even the courtly society, which continued to enjoy the now-prohibited chess tournaments uninterrupted. The pieces, which had been nonrepresentational in Islamic countries (see piece values in shantranj), changed shape in Christian cultures. Carved images of men and animals reappeared. The shape of the rook, originally a rectangular block with a V-shaped cut in the top, changed; the two top parts separated by the split tended to get long and hang over, and in some old pictures look like horses' heads. The split top of the piece now called the bishop was interpreted as a bishop's