Relative Value
The value assigned to a piece attempts to represent the strength this piece potentially has in a game. With game circumstances constantly changing, so do the values assigned to the pieces. A bishop positioned to control long, open diagonal spaces appears more valuable than a knight stuck in a corner. Similar ideas apply to placing rooks on open files and knights on active, central squares. The standard valuation is one point for a pawn, three points for a knight or bishop, five points for a rook, and nine points for a queen (Hooper & Whyld 1992:438–39). These values are general throughout a game; in specific circumstances the values may be quite different—a knight can be more valuable than a queen in a particular decisive attack.
Read more about this topic: Chess Piece
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