public static int CalculateScore(ChessBoard cb, ThreadData threadData)
{
var score = MaterialUtil.ScoreUnknown;
if (BitOperations.PopCount((ulong)cb.AllPieces) <= 5)
{
score = MaterialUtil.IsDrawByMaterial(cb)
? EvalConstants.ScoreDraw
: MaterialUtil.CalculateEndgameScore(cb);
}
if (score == MaterialUtil.ScoreUnknown)
{
score = TaperedEval(cb, threadData);
if (score > 25)
{
score = AdjustEndgame(cb, score, White, threadData.MaterialCache);
}
else if (score < -25)
{
score = AdjustEndgame(cb, score, Black, threadData.MaterialCache);
}
}
score *= ColorFactor[cb.ColorToMove];
if (EngineConstants.TestEvalCaches)
{
var cachedScore = EvalCacheUtil.GetScore(cb.ZobristKey, threadData.EvalCache);
if (cachedScore != CacheMiss)
{
if (cachedScore != score)
{
throw new ArgumentException($"Cached eval score != score: {cachedScore}, {score}");
}
}
}
EvalCacheUtil.AddValue(cb.ZobristKey, score, threadData.EvalCache);
if (EngineConstants.TestEvalValues)
{
ChessBoardTestUtil.CompareScores(cb);
}
return(score);
}
public static int GetScore(ChessBoard cb, ThreadData threadData)
{
if (Statistics.Enabled)
{
Statistics.EvalNodes++;
}
if (EngineConstants.EnableEvalCache && !EngineConstants.TestEvalCaches)
{
var score = EvalCacheUtil.GetScore(cb.ZobristKey, threadData.EvalCache);
if (score != CacheMiss)
{
return(score);
}
}
return(CalculateScore(cb, threadData));
}