public TranspositionNode(NodeType nodeType, int score, int depth, Move bestMove, PVList pv)
{
NodeType = nodeType;
Score = score;
Depth = depth;
BestMove = bestMove;
PV = pv;
}
public TTHit TryGetValue(ulong key, int depth, int alpha, int beta, PVList currentPV)
{
TTHit hit = new TTHit();
hit.HitType = HitType.Miss;
bool found = table.TryGetValue(key, out hit.TTNode);
if (found)
{
hit.HitType = HitType.Useless;
if (hit.TTNode.Depth >= depth)
{
switch (hit.TTNode.NodeType)
{
case NodeType.CutNode:
if (hit.TTNode.Score >= beta)
{
hit.HitType = HitType.Hit;
hit.Score = beta;
}
break;
case NodeType.AllNode:
if (hit.TTNode.Score <= alpha)
{
hit.HitType = HitType.Hit;
hit.Score = alpha;
}
break;
case NodeType.PVNode:
hit.HitType = HitType.Hit;
hit.Score = hit.TTNode.Score;
currentPV.Replace(hit.TTNode.PV);
break;
}
}
else if (hit.TTNode.Depth >= depth - engineConfig.NullMoveDepthReduction &&
hit.TTNode.NodeType != NodeType.CutNode && hit.TTNode.Score < beta)
{
hit.HitType = HitType.AvoidNullMove;
}
}
return(hit);
}