public static float Score(Board board, Piece.Colour player, AIConstants constants)
{
return(new BoardScorer(board, player, constants).Score());
}
public AIPlayer(BoardNode board, Piece.Colour colour) : base(board, colour)
{
MoveChooser = new MoveChooser(colour);
Constants = AIConstants.Default;
}
public BoardScorer(Board board, Piece.Colour player, AIConstants constants)
{
Board = board;
Player = player;
Constants = constants;
}
/// <summary>
/// Chooses the *best* move from a set of moves.
/// </summary>
/// <param name="board"></param>
/// <param name="moves"></param>
/// <returns></returns>
public Move ChooseMove(Board board, HashSet <Move> moves)
{
if (moves.Count == 0)
{
Godot.GD.Print("oh no");
}
AIConstants constants = AIConstants.Default;
float highestScore = float.NegativeInfinity;
Move bestMove = moves.First();
foreach (var move in moves)
{
var b = board.Clone();
b.DoMove(move, _ => Piece.PieceType.Queen);
float min = float.PositiveInfinity;
var nextMoves = b.GetMoves(Player.Opposite());
foreach (var nm in nextMoves)
{
var b2 = b.Clone();
b2.DoMove(nm, _ => Piece.PieceType.Queen);
var score = BoardScorer.Score(b2, Player, constants);
if (score < min)
{
min = score;
}
}
// This stops the AI from oscilalting between positions
if (History.Count > 2)
{
if (move == History[History.Count - 2])
{
// Godot.GD.Print("repeat >:(");
min += constants.RepeatMoveScore;
}
}
if (min > highestScore)
{
highestScore = min;
bestMove = move;
}
// var score = BoardScorer.Score(b, Player, constants);
// if (score > highestScore)
// {
// highestScore = score;
// bestMove = move;
// }
}
History.Add(bestMove);
return(bestMove);
}