protected void Think(Color playerToMove)
{
PrincipalVariation = new PrincipalVariation(Board.BoardSize);
FollowPV = true;
TranspositionTableHits = 0;
int lBestValue = 0;
if (SearchOptions.IncludeEndGameMoves)
{
TranspositionTable = TranspositionTableEndGame;
}
else
{
TranspositionTable = TranspositionTablePrimary;
}
int lStart = (SearchOptions.StartPly <= SearchOptions.MaxPly) ? SearchOptions.StartPly : SearchOptions.MaxPly;
if (lStart <= 0)
{
lStart = 1;
}
for (int lDepth = lStart; lDepth <= SearchOptions.MaxPly; lDepth++)
{
SearchComplete = true;
FollowPV = true;
lBestValue = Search(playerToMove, lDepth, 0, -10000, 10000);
Console.Error.WriteLine("Ply: " + lDepth + " - " + SearchStatus.Timer.SecondsElapsed + " Seconds - Nodes/TT Hits: " + NodesSearched.ToString() + "/" + TranspositionTableHits.ToString() + " - Best: " + Board.Coord.ToString(PrincipalVariation.BestMove) + " (" + lBestValue + ")");
SearchStatus.UpdateBestMove(PrincipalVariation.BestMove, lBestValue);
SearchStatus.CurrentPly = lDepth;
SearchStatus.MaxPly = lDepth;
SearchStatus.PercentComplete = (lDepth / SearchOptions.MaxPly) * 100;
UpdateStatus();
if (StopThinkingFlag)
{
break;
}
if (SearchComplete)
{
Console.Error.WriteLine("Ply: " + lDepth + " - Search Completed!");
break;
}
}
}
public int Search(Color playerToMove, int maxPly, int depth, int alpha, int beta)
{
if ((depth == maxPly) || ((depth != 0) && (SearchInterface.IsGameOver())))
{
NodesEvaluated++;
return(SearchInterface.Evaluate(playerToMove));
}
PrincipalVariation.SetPVLength(depth);
MoveList lMoves = SearchInterface.GetMoveList(playerToMove, SearchOptions.IncludeEndGameMoves);
SearchInterface.PruneMoveList(lMoves);
if ((SearchOptions.UsePatterns) && (lMoves.Count != 0))
{
PatternMap lPatternMap = SearchOptions.PatternDetector.FindPatterns(Board, playerToMove, lMoves.AllMoves);
lPatternMap.UpdateMoveList(lMoves);
}
if (lMoves.Count == 0)
{
lMoves.Add(CoordinateSystem.PASS);
}
if ((lMoves.Count == 1) && (lMoves[0] == CoordinateSystem.PASS) && (Board.LastMove == CoordinateSystem.PASS))
{
PrincipalVariation.UpdatePV(depth, CoordinateSystem.PASS);
NodesEvaluated++;
return(SearchInterface.Evaluate(playerToMove));
}
SearchInterface.SortMoveList(lMoves);
if (UpdateStatusFlag)
{
UpdateStatus();
}
if (StopThinkingFlag)
{
Stop();
}
int lSuperKoCount = 0;
foreach (int lMove in lMoves)
{
NodesSearched++;
bool lPlayed = Board.PlayStone(lMove, playerToMove, true);
if (!lPlayed)
{
throw new ApplicationException("SearchMethodAlphaBetaIterative.cs: You hit a bug!");
}
if ((CheckSuperKo) && (Board.IsSuperKo()))
{
lSuperKoCount++;
Board.Undo();
}
else
{
int lScore = -Search(playerToMove.Opposite, maxPly, depth + 1, -beta, -alpha);
Board.Undo();
if (lScore > alpha)
{
if (lScore >= beta)
{
return(beta);
}
alpha = lScore;
PrincipalVariation.UpdatePV(depth, lMove);
if (depth == 0)
{
if (lScore > SearchStatus.BestValue)
{
SearchStatus.UpdateBestMove(lMove, lScore);
}
Console.Error.WriteLine("Move: " + Board.Coord.ToString(lMove) + " (" + lScore.ToString() + ")");
}
}
}
}
if (lSuperKoCount == lMoves.Count)
{
return(SearchInterface.Evaluate(playerToMove));
}
return(alpha);
}
protected int Search(Color playerToMove, int maxPly, int depth)
{
if ((depth == maxPly) || ((depth != 0) && (SearchInterface.IsGameOver())))
{
NodesEvaluated++;
return(SearchInterface.Evaluate(playerToMove));
}
MoveList lMoves = SearchInterface.GetMoveList(playerToMove, SearchOptions.IncludeEndGameMoves);
SearchInterface.PruneMoveList(lMoves);
if ((SearchOptions.UsePatterns) && (lMoves.Count != 0))
{
PatternMap lPatternMap = SearchOptions.PatternDetector.FindPatterns(Board, playerToMove, lMoves.AllMoves);
lPatternMap.UpdateMoveList(lMoves);
}
if (lMoves.Count == 0)
{
lMoves.Add(CoordinateSystem.PASS);
}
if ((lMoves.Count == 1) && (lMoves[0] == CoordinateSystem.PASS) && (Board.LastMove == CoordinateSystem.PASS))
{
NodesEvaluated++;
return(SearchInterface.Evaluate(playerToMove));
}
if (UpdateStatusFlag)
{
UpdateStatus();
}
if (StopThinkingFlag)
{
Stop();
}
int lSuperKoCount = 0;
int lBest = Int32.MinValue;
int lBestMove = CoordinateSystem.PASS; // dummy value
foreach (int lMove in lMoves)
{
NodesSearched++;
bool lPlayed = Board.PlayStone(lMove, playerToMove, true);
if (!lPlayed)
{
throw new ApplicationException("SearchMethodAlphaBetaIterative.cs: You hit a bug!");
}
if ((CheckSuperKo) && (Board.IsSuperKo()))
{
lSuperKoCount++;
Board.Undo();
}
else
{
int lScore = -Search(playerToMove.Opposite, maxPly, depth + 1);
Board.Undo();
if (depth == 0)
{
MoveList.Add(lMove, lScore);
if (lScore > SearchStatus.BestValue)
{
SearchStatus.UpdateBestMove(lMove, lScore);
}
Console.Error.WriteLine("# " + MoveList.Count + " - Move: " + Board.Coord.ToString(lMove) + " (" + lScore.ToString() + ")");
}
if (lScore > lBest)
{
lBest = lScore;
lBestMove = lMove;
}
}
}
if (lSuperKoCount == lMoves.Count)
{
return(SearchInterface.Evaluate(playerToMove));
}
return(lBest);
}