|Keyword Query:||Chess Pin Means A Piece Is Stuck On A Square Or Line|
|Interpretation:||You want to know whether a Pawn or Piece must remain where it is, IF it's caught by a Pin Attack.|
The short answer is "it depends on the situation" ...
The Chess Tactic known as a 'Pin', attacks a lower-value enemy unit (Pawn or Piece) sitting infront of - thus, now, protecting - a higher-value Piece.
If the higher value Piece, behind, is a King, then the unit infront CANNOT move - it must remain on its square, to avoid leaving its King in "Check".
This type of Pin is known as an "Absolute Pin", which can be seen in the following image:
In the above image, White's Pawn is prevented from gaining Promotion, as it's being 'Pinned' against its King, to avoid it being "Checked" by Black's Rook.
This is one of the reasons for playing a Pin Attack - rather than capturing, it's often used to prevent an enemy Pawn or Piece from moving to a better position or gaining an advantage elsewhere on the Board.
If the higher value Piece, behind, is another Piece (but NOT the King), you may choose whether to move the 'Pinned' unit infront, or to leave it protecting the higher-value Piece, to its rear.
This type of Pin is known as a "Relative Pin".
KEYWORD: Chess Pin Means A Piece Is Stuck On A Square Or Line
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