public static EvaluationScore ToRelative(this EvaluationScore score, int plyDistance)
{
//// ReSharper disable once ArrangeRedundantParentheses
return(score.IsCheckmating()
? new EvaluationScore(score.Value - plyDistance)
: (score.IsGettingCheckmated() ? new EvaluationScore(score.Value + plyDistance) : score));
}
private VariationLine(
EvaluationScore value,
EvaluationScore?localValue,
[NotNull] ICollection <GameMove> moves)
: this(value, localValue)
{
if (moves is null)
{
throw new ArgumentNullException(nameof(moves));
}
_movesInternal.AddRange(moves);
}
private VariationLine(EvaluationScore value, EvaluationScore?localValue)
{
if (value.Value.Abs() > EvaluationScore.MateValue)
{
throw new ArgumentOutOfRangeException(
nameof(value),
value.Value,
$@"The score value is out of the valid range [{-EvaluationScore.MateValue:#,##0} .. {
EvaluationScore.MateValue:#,##0}].");
}
_movesInternal = new List <GameMove>();
Value = value;
LocalValue = localValue;
Moves = _movesInternal.AsReadOnly();
}
public static int?GetMateMoveDistance(this EvaluationScore evaluationScore)
{
if (!evaluationScore.IsAnyMate())
{
return(null);
}
var score = evaluationScore.Value;
var plyDistance = EvaluationScore.MateValue - score.Abs();
if (plyDistance < 0)
{
throw new InvalidOperationException($@"Invalid score value: {score}.");
}
var mateMoveDistance = (plyDistance + 1) / 2;
return(evaluationScore.Value > 0 ? mateMoveDistance : -mateMoveDistance);
}
public VariationLine(EvaluationScore value)
: this(value, null)
{
// Nothing to do
}
public static bool IsGettingCheckmated(this EvaluationScore evaluationScore)
{
return(-evaluationScore.Value >= MateScoreLowerBound);
}
public static bool IsAnyMate(this EvaluationScore evaluationScore)
{
return(evaluationScore.Value.Abs() >= MateScoreLowerBound);
}
public static EvaluationScore Min(EvaluationScore score1, EvaluationScore score2)
{
return(score1.Value <= score2.Value ? score1 : score2);
}
