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
Dabbaba (chess) Dabbaba (chess) A dabbaba (or dabaaba, dabbabah) is a fairy chess piece that jumps two squares orthogonally (the directions a chess rook can move), leaping over any intermediate piece. In notation, it is given the symbol D. The dabbaba is a very old piece, appearing in some very early chess variants, such as Tamerlane chess. The name "dabbaba" (Arabic: دَبَّابَة) means "tank (vehicle)" in Modern Arabic. In older Arabic, it referred to a type of medieval siege engine designed to shelter men who are digging a hole in enemy fortifications (Latin: "vinea"). The name has sometimes been translated as "war