Function isColoredPiece

isColoredPiece(
    value: unknown,
): value is
    | "br"
    | "bb"
    | "bp"
    | "bq"
    | "bk"
    | "bn"
    | "wr"
    | "wb"
    | "wp"
    | "wq"
    | "wk"
    | "wn"
Whether the given value represents a valid ColoredPiece or not.
Parameters
- value: unknown
Returns value is
    | "br"
    | "bb"
    | "bp"
    | "bq"
    | "bk"
    | "bn"
    | "wr"
    | "wb"
    | "wp"
    | "wq"
    | "wk"
    | "wn"