/// <summary>
/// Player should at least:
/// * Check if there is immediate checkmate available
/// * Check if there is possible checkmate in two turns.
///
/// </summary>
/// <param name="allMoves"></param>
/// <returns></returns>
private SingleMove AnalyzeBestMove(IList <SingleMove> allMoves)
{
var isMaximizing = IsPlayerWhite;
if (Phase == GamePhase.MidEndGame || Phase == GamePhase.EndGame)
{
var checkMate = MoveResearch.ImmediateCheckMateAvailable(allMoves, Board, isMaximizing);
if (checkMate != null)
{
return(checkMate);
}
var twoTurnCheckMates = MoveResearch.CheckMateInTwoTurns(allMoves, Board, isMaximizing);
if (twoTurnCheckMates.Count > 1)
{
var evaluatedCheckMates = MoveResearch.GetMoveScoreListParallel(twoTurnCheckMates, SearchDepth, Board, isMaximizing);
return(MoveResearch.SelectBestMove(evaluatedCheckMates, isMaximizing));
}
else if (twoTurnCheckMates.Count > 0)
{
return(twoTurnCheckMates.First());
}
}
// TODO separate logic to different layers. e.g. player depth at 2, 4 and when to use simple isCheckMate
var evaluated = MoveResearch.GetMoveScoreListParallel(allMoves, SearchDepth, Board, isMaximizing);
SingleMove bestMove = MoveResearch.SelectBestMove(evaluated, isMaximizing);
return(bestMove);
}
public void UpdateCastlingStatusFromMove(SingleMove move)
{
if (move.NewPos.row == 0)
{
WhiteLeftCastlingValid = false;
WhiteRightCastlingValid = false;
}
else if (move.NewPos.row == 7)
{
BlackLeftCastlingValid = false;
BlackRightCastlingValid = false;
}
}
public sealed override void ReceiveMove(IMove opponentMove)
{
LatestOpponentMove = opponentMove;
if (!_connectionTestOverride)
{
// Basic validation
var move = new SingleMove(opponentMove);
if (Board.ValueAt(move.PrevPos) == null)
{
throw new ArgumentException($"Player [isWhite={!IsPlayerWhite}] Tried to move a from position that is empty");
}
if (Board.ValueAt(move.PrevPos) is PieceBase opponentPiece)
{
if (opponentPiece.IsWhite == IsPlayerWhite)
{
throw new ArgumentException($"Opponent tried to move player piece");
}
}
// TODO intelligent analyzing what actually happened
if (Board.ValueAt(move.NewPos) is PieceBase playerPiece)
{
// Opponent captures player targetpiece
if (playerPiece.IsWhite == IsPlayerWhite)
{
move.Capture = true;
}
else
{
throw new ArgumentException("Opponent tried to capture own piece.");
}
}
Board.ExecuteMove(move);
GameHistory.Add(opponentMove);
TurnCount++;
}
}