The Bishop is the only piece restricted to a single color square throughout the game. This makes it sensitive to changes in the Pawn structure for both players.
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Relative Value of Chess Pieces :
Minor piece exchanges
- The Bishop • 'The relative value of this piece has given rise to different opinions among masters and authorities.' ('Relative Value of Pieces and Principles of Play' by Wilhelm Steinitz)
[Image: Mark of Westminster, www.ChessUSA.com, used with permission]