private double GetTheBestMoveRating(GameState gameState, ChessColor botColor, int deep)
{
if (gameState.GameStatus == GameStatus.Finished)
return GetGameRatingFromGameResult(gameState.GetGameResult());
var availableMovesRatings = gameState.GetAvailableMoves()
.Select(move =>
{
var gameStateClone = (GameState) gameState.Clone();
gameStateClone.Move(move);
return deep == 0
? _gameStateRatingCalculator.GetGameStateRating(gameStateClone)
: GetTheBestMoveRating(gameStateClone, botColor.GetOppositeChessColor(), deep - 1);
});
switch (botColor)
{
case ChessColor.White:
return availableMovesRatings.Max();
case ChessColor.Black:
return availableMovesRatings.Min();
default:
throw new ArgumentOutOfRangeException(nameof(botColor));
}
}
public GameMove GetTheBestMove(GameState gameState, ChessColor botColor)
{
var availableMovesRatings = gameState.GetAvailableMoves()
.Select(move =>
{
var gameStateClone = (GameState) gameState.Clone();
gameStateClone.Move(move);
return new
{
Rating = GetTheBestMoveRating(gameStateClone, botColor.GetOppositeChessColor(), _botLevel - 1),
Move = move
};
});
switch (botColor)
{
case ChessColor.White:
return availableMovesRatings.OrderByDescending(x => x.Rating).First().Move;
case ChessColor.Black:
return availableMovesRatings.OrderBy(x => x.Rating).First().Move;
default:
throw new ArgumentOutOfRangeException(nameof(botColor));
}
}
public bool IsGameFinished(Chessboard chessboard, GameHistory gameHistory, ChessColor lastTurnBy)
{
return(!GetAvailableMoves(chessboard, lastTurnBy.GetOppositeChessColor(), gameHistory).Any() ||
gameHistory.IsPositionRepeatedThreeTimes);
}
