public override PlayerResult GetMove(OthelloBoard board)
{
StringBuilder statusString = new StringBuilder();;
_finalEvaluations = 0;
_boardEvaluations = 0;
#if USE_TRANSPOSITION_TABLE
_transpositionHits = 0;
_transpositionTable._wrongEntriesFound = 0;
_transpositionTable._tooShallowEntriesFound = 0;
#endif
DateTime startTime = DateTime.Now;
OthelloMoveWithData[] moves = board.GetValidMovesWithData();
MoveWithValue[] movesWithValue = new MoveWithValue[moves.Length];
for (int i = 0; i < moves.Length; i++)
{
movesWithValue[i] = new MoveWithValue();
movesWithValue[i].Move = moves[i];
}
int currentPly;
#if USE_ITERATIVE_DEEPENING
for (currentPly = 0; ; currentPly++)
{
//for (currentPly = 0; currentPly<2; currentPly++) {
#else
for (int currentPly = ply - 1; currentPly < ply; currentPly++)
{
#endif
statusString.Length = 0;
DateTime startIterationTime = DateTime.Now;
statusString.Append("Depth " + (currentPly + 1).ToString() + ": ");
// Should we do a final search
if (board.EmptySquares <= 15 && currentPly > 5)
{
currentPly = board.EmptySquares;
}
int alpha = WORST_MOVE;
int beta = BEST_MOVE;
foreach (MoveWithValue move in movesWithValue)
{
board.PlayMove(move.Move);
statusString.Append(move.Move.ToString());
this.PostStatus(statusString.ToString());
move.Value = (-GetBoardValueRecursive(board, currentPly, 2, -beta, -alpha));
if (move.Value != BEST_MOVE && move.Value != WORST_MOVE)
{
statusString.Append("(" + move.Value.ToString() + ")");
}
statusString.Append(" ");
this.PostStatus(statusString.ToString());
board.UnplayMove(move.Move);
if (move.Value > alpha)
{
alpha = move.Value;
}
if (alpha >= beta)
{
break;
}
}
Array.Sort(movesWithValue);
// If we've already search to the end, we're done
if (currentPly == board.EmptySquares)
{
break;
}
if (movesWithValue[0].Value < -500 || movesWithValue[0].Value > 500)
{
break;
}
TimeSpan t = DateTime.Now - startTime;
if (t.TotalSeconds >= 3)
{
break;
}
}
PlayerResult result = new PlayerResult();
result.Move = movesWithValue[0].Move;
TimeSpan processingTime = DateTime.Now - startTime;
statusString.Append("\r\nEvals: " + _boardEvaluations + " Final evals: " + _finalEvaluations + "\r\n");
#if USE_TRANSPOSITION_TABLE
/*
* statusString.Append("Transp: " + _transpositionHits +
* " wrong hits: " + _transpositionTable._wrongEntriesFound +
* " shallow hits: " + _transpositionTable._tooShallowEntriesFound + "\r\n");
*/
#endif
statusString.Append("Score: " + movesWithValue[0].Value + " (" + processingTime + ")");
result.Status = statusString.ToString();
return(result);
}
