The value assigned to a piece attempts to represent the potential strength of the piece in the game. As the game develops, the relative values of the pieces will also change. A bishop positioned to control long, open diagonal spaces is usually 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 reliable in endgames, particularly with a limited number of pieces. But these values can change dramatically depending on the position, the phase of the game (opening, middle game, endings). A bishop pair for example, is worth a half a pawn on average (Soltis 2004:183). In specific circumstances, the values may be quite different: a knight can be more valuable than a queen in a particular decisive attack.
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