Editing Chess piece (section)

==Relative value==
{{Main|Chess piece relative value}}
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. For example, in an {{chessgloss|open game}}, bishops are relatively more valuable; they can be [[Chess strategy#Positioning|positioned]] to control long, open diagonal spaces.  In a {{chessgloss|closed game}} with lines of protected pawns blocking bishops, knights usually become relatively more potent. Similar ideas apply to placing rooks on [[open file]]s and knights on active, {{chessgloss|center|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.<ref>{{harvcol|Hooper|Whyld|1992|pp=438–39}}</ref> These values are reliable in endgames, particularly with a limited number of pieces. But these values can change depending on the position or the phase of the game (opening, middle game, or ending). A {{chessgloss|bishop pair}} for example, is worth an additional half-pawn on average.<ref>{{harvcol|Soltis|2004|p=183}}</ref> In specific circumstances, the values may be quite different: sometimes a knight can be more valuable than a queen if a particular angle is required for a mating attack, such as certain [[smothered mate]]s.  The humble pawn becomes more and more valuable the closer it is to securing a queen promotion for another example.