/// <summary>
/// Returns a value for the given move that indicates its immediate threat.
/// Non-capture moves have a default value of zero, while captures have a
/// value that is the ratio of the captured piece to the moving piece. Pawns
/// promoting to queen are given an additional increase in value.
/// </summary>
/// <param name="move">The move to consider.</param>
/// <returns>A value for the given move that is useful for move ordering.</returns>
private Single MoveOrderingValue(Int32 move)
{
Single value = PieceValue[Move.Capture(move)] / (Single)PieceValue[Move.Piece(move)];
if (Move.IsQueenPromotion(move))
{
value += QueenPromotionMoveValue;
}
return(value);
}
