/// <summary>
/// Add the current packed board to the history
/// </summary>
/// <param name="l64ZobristKey"> Zobrist key of the board</param>
/// <param name="bPawnMoveOrPieceEaten"> true if a pawn has moved or a piece has been eaten</param>
/// <returns>
/// Result: NoRepeat, ThreeFoldRepeat or FiftyRuleRepeat
/// </returns>
public ChessBoard.RepeatResultE AddCurrentPackedBoard(long l64ZobristKey, bool bPawnMoveOrPieceEaten)
{
ChessBoard.RepeatResultE eRetVal = ChessBoard.RepeatResultE.NoRepeat;
int iHashIndex;
int iNewArraySize;
byte count;
PackedBoard[] arrNew;
l64ZobristKey ^= (int)m_packedBoardCurrent.m_eInfo;
if (m_iMoveCount >= m_iPackedBoardArraySize)
{
iNewArraySize = m_iPackedBoardArraySize * 2;
arrNew = new PackedBoard[iNewArraySize];
Array.Copy(m_arrPackedBoard, arrNew, m_iPackedBoardArraySize);
m_iPackedBoardArraySize = iNewArraySize;
}
iHashIndex = (int)(l64ZobristKey & 16383);
count = ++m_arrHashCount[iHashIndex];
m_arrHashCount[iHashIndex] = count;
if (bPawnMoveOrPieceEaten)
{
m_iCountMoveDepth++;
m_arrCountMove[m_iCountMoveDepth] = 0;
}
else
{
if (++m_arrCountMove[m_iCountMoveDepth] >= 50)
{
eRetVal = ChessBoard.RepeatResultE.FiftyRuleRepeat;
}
else
{
// A count > 2 is only an indication that 3 or more identical board may exist
// because 2 non-identical board can share the same slot
if (count > 2 && GetBoardCount(m_packedBoardCurrent) >= 2)
{
eRetVal = ChessBoard.RepeatResultE.ThreeFoldRepeat;
}
}
}
m_arrPackedBoard[m_iMoveCount++] = m_packedBoardCurrent;
return(eRetVal);
}
/// <summary>
/// Add the current packed board to the history
/// </summary>
/// <param name="l64ZobristKey"> Zobrist key of the board</param>
/// <returns>
/// Result: NoRepeat, ThreeFoldRepeat or FiftyRuleRepeat
/// </returns>
public ChessBoard.RepeatResultE CurrentRepeatResult(long l64ZobristKey)
{
ChessBoard.RepeatResultE eRetVal = ChessBoard.RepeatResultE.NoRepeat;
int iHashIndex;
byte count;
iHashIndex = (int)(l64ZobristKey & 16383);
count = m_arrHashCount[iHashIndex];
if (m_arrCountMove[m_iCountMoveDepth] >= 50)
{
eRetVal = ChessBoard.RepeatResultE.FiftyRuleRepeat;
}
else
{
// A count > 2 is only an indication that 3 or more identical board may exist
// because 2 non-identical board can share the same slot
if (count > 2 && GetBoardCount(m_packedBoardCurrent) >= 2)
{
eRetVal = ChessBoard.RepeatResultE.ThreeFoldRepeat;
}
}
return(eRetVal);
}