Chess piece relative value

In chess, a relative value (or point value) is a numerical value conventionally assigned to each piece. Piece valuations have no role in the rules of chess but are useful as an aid to evaluating an exchange of pieces.

The best-known system assigns 1 point to a pawn, 3 points to a knight or bishop, 5 points to a rook, and 9 points to the queen. For instance, sacrificing a knight or bishop under such an evaluation can still be considered a fair exchange if one can ensure the capture of three or more pawns in return. But valuation systems provide only a rough guide; a piece's true value can vary significantly depending on its position relative to all other pieces on the board.

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