/// <summary>
/// Score function. Return a score for a given board.
/// </summary>
/// <returns>Returns a score for a given board</returns>
public int Score()
{
int score = 0;
int[,] theBoard = board.GetBoard();
int playerVal = isWhitePlayer ? 1 : 0; // Get the player value in the board array
for (int i = 0; i < theBoard.GetLength(1); i++)
{
for (int j = 0; j < theBoard.GetLength(0); j++)
{
int boardValue = theBoard[j, i];
if (boardValue != -1)
{
if (boardValue == playerVal)
{
score += OthelloBoard.SCORE_MATRIX[j, i]; // Add the matrix score if is the correct player
}
else
{
score -= OthelloBoard.SCORE_MATRIX[j, i]; // Substract the matrix score if is the other player
}
}
}
}
Tuple <int, int> nbPawns = OthelloBoard.CountPawn(theBoard, playerVal);
score += 25 * ((nbPawns.Item1 + nbPawns.Item2 + 1) % 2); //Add a weight if the current user play the last move
score += 25 * ((nbPawns.Item1 - nbPawns.Item2) / (nbPawns.Item1 + nbPawns.Item2)); //Add a weight from the pawn parity
Tuple <int, int> nbCorners = OthelloBoard.CountCorner(theBoard, playerVal);
if (nbCorners.Item1 + nbCorners.Item2 != 0)
{
score += 100 * (nbCorners.Item1 - nbCorners.Item2) / (nbCorners.Item1 + nbCorners.Item2);//Add weight from the number of captured corner
}
// If the state is final
if (IsFinal())
{
// If the score is positive, the user win
if (score > 0)
{
return(Int32.MaxValue - 1);
}
else // If the score is negative, the user loose
{
return(Int32.MinValue + 1);
}
}
return(score);
}
