private int minimax(State state, int depth, int min, int max) {
    ArrayList<Move> moves = generateMoves(state.board, state.colour);
    char opponent = (state.colour == DraughtBoard.WHITE) ? DraughtBoard.BLACK : DraughtBoard.WHITE;

    if (moves.size() == 1)
        nextMove = moves.get(0);

    int bestScore;
    Move bestMove = new Move();
    int score = 0;

    if (depth == 0 || moves.size() == 0) {
        return evaluateBoard(state);
    }

    if (colour == DraughtBoard.WHITE) {
        bestScore = min;
        for (Move move : moves) {
            char[][] temp = state.board.clone();
            boolean scored = simulateMove(move, temp);

            State nextState = new State(temp, opponent, state.whiteScore, state.blackScore);
            if (scored) state.whiteScore++;

            score = minimax(state, depth-1, bestScore, max);

            if (score > bestScore) {
                bestScore = score;
                bestMove = move;
            }
            if (bestScore > max) return max;
        }
        nextMove = bestMove;
        return bestScore;
    } else {
        bestScore = max;
        for (Move move : moves) {
            char[][] temp = state.board.clone();
            boolean scored = simulateMove(move, temp);

            State nextState = new State(temp, opponent, state.whiteScore, state.blackScore);
            if (scored) state.blackScore++;

            score = minimax(state, depth-1, min, bestScore);

            if (score < bestScore) {
                bestScore = score;
                bestMove = move;
            }
            if (bestScore < min) return min;
        }
        nextMove = bestMove;
        return bestScore;
    }
}