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In statistics, a k-th percentile, also known as percentile score or centile, is a score (e.g., a data point) below which a given percentage k of arranged scores in its frequency distribution falls ("exclusive" definition) or a score at or below which a given percentage falls ("inclusive" definition); i.e. a score in the k-th percentile would be above approximately k% of all scores in its set.
Two minor pieces plus two pawns are sometimes as good as a queen. Two rooks are sometimes better than a queen and pawn. [57] Many of the systems have a 2-point difference between the rook and a minor piece, but most theorists put that difference at about 1 + 1 ⁄ 2 points (see The exchange (chess) § Value of the exchange).