public void Play()
{
Move bestMove;
List <(Position, Move)> nextPositionMoveTupleList = currentPosition.GeneratePositions();
while (result == null)
{
if (currentPosition.toMove == WHITE)
{
// Make the white player find a move and apply it to the position.
bestMove = Engine.FindBestMove(whitePlayer.EvaluatePosition, currentPosition,
nextPositionMoveTupleList, engineDepth, -2.0f, 2.0f).Item1;
currentPosition = currentPosition.MakeMove(bestMove);
if (currentPosition.fiftyMoveProximity >= 100)
{
result = DRAW;
}
else
{
nextPositionMoveTupleList = currentPosition.GeneratePositions();
if (nextPositionMoveTupleList.Count == 0)
{
// White just played a move which doesn't give black any pseudo-legal moves.
isCheck = currentPosition.IsCheck();
result = isCheck ? WHITE_WIN : DRAW;
}
else if (nextPositionMoveTupleList.Last().Item1 == null)
{
// White just played an illegal move (which only happens when there are no legal moves).
result = isCheck ? BLACK_WIN : DRAW;
}
isCheck = currentPosition.IsCheck();
}
}
else
{
// Make the black player find a move and apply it to the position.
bestMove = Engine.FindBestMove(blackPlayer.EvaluatePosition, currentPosition,
nextPositionMoveTupleList, engineDepth, -2.0f, 2.0f).Item1;
currentPosition = currentPosition.MakeMove(bestMove);
if (currentPosition.fiftyMoveProximity >= 100)
{
result = DRAW;
}
else
{
nextPositionMoveTupleList = currentPosition.GeneratePositions();
if (nextPositionMoveTupleList.Count == 0)
{
// Black just played a move which doesn't give white any pseudo-legal moves.
isCheck = currentPosition.IsCheck();
result = isCheck ? BLACK_WIN : DRAW;
}
if (nextPositionMoveTupleList.Last().Item1 == null)
{
// Black just played an illegal move (which only happens when there are no legal moves).
result = isCheck ? WHITE_WIN : DRAW;
}
isCheck = currentPosition.IsCheck();
}
}
if (storeGame)
{
moveHistory.Add(UCIProtocol.MoveToUCINotation(bestMove) + " ");
}
}
}