/**
* Returns the score of the given move made by the given color based upon searches to the
* specified depth.
*
* @param m the move to score
* @param depth the max depth to search to
* @param color the player who makes the move
* @return the score of the move
*/
private int getScore(Move m, int depth, int color, int a, int b) {
board.makeMove(m, color);
depth--;
int score = 0;
if (board.hasNetwork(oppositeColor(this.color))) {
score = Scorer.MINSCORE - depth;
} else if (board.hasNetwork(this.color)) {
score = Scorer.MAXSCORE + depth;
} else if (depth == 0 || Scorer.hasScore(board, color)) {
score = Scorer.getScore(board, this.color);
} else {
score = chooseMove(depth, oppositeColor(color), a, b).score;
Scorer.addScore(board, color, score);
}
board.rollback();
return score;
}
/**
* Returns a new <code>Move</code> by this player. Internally records the move (update the
* internal game board) as a move by this player. Changes search depth based on whether pieces are
* being added or stepped
*
* @return the Move chosen by this player
*/
public Move chooseMove() {
int maxDepth = searchDepth;
if (maxDepth == VARDEPTH) {
if (board.getNumPieces(color) > 8) // Step move
maxDepth = 4;
else // Add move
maxDepth = 4;
}
Move m;
if (board.getNumPieces(color) == 0) { // First move starts in center
m = new Move(3, 3);
if (!board.isValidMove(m, color)) m = new Move(3, 4);
} else {
ScoreMove sm = chooseMove(maxDepth, color, Scorer.MINSCORE - 1, Scorer.MAXSCORE + 1);
m = sm.move;
Scorer.clearCache();
}
board.makeMove(m, color);
return m;
}
/**
* Forces this player to make the specified move if legal and returns true. If the move is not
* legal, returns false and does not record the move.
*
* @param m the Move forced to make
* @return true if legal move, false otherwise
*/
public boolean forceMove(Move m) {
if (!board.isValidMove(m, color)) return false;
board.makeMove(m, color);
return true;
}
/**
* Records the specified move as a move by the opponent if it is legal and returns true. If the
* move is not legal, returns false and does not record the move.
*
* @param m the Move provided by the opponent
* @return true if legal move, false otherwise
*/
public boolean opponentMove(Move m) {
if (!board.isValidMove(m, oppositeColor(color))) return false;
board.makeMove(m, oppositeColor(color));
return true;
}