用c语言写较为复杂的六子棋评分函数

六子棋评分函数可以分为两个部分：开局和中后期。开局是指前10步左右的阶段，中后期是指之后的阶段。以下是一个可能的较为复杂的六子棋评分函数的示例代码，使用了alpha-beta剪枝算法进行优化：

#define BOARD_SIZE 15
#define EMPTY 0
#define BLACK 1
#define WHITE 2
#define INF 999999

int score[2][6] = { {0, 100, 500, 800, 1500, INF}, {0, 50, 250, 500, 1000, INF} };

int evaluate(int board[BOARD_SIZE][BOARD_SIZE], int player) {
    int opponent = (player == BLACK) ? WHITE : BLACK;
    int score_player = 0, score_opponent = 0;
    int count_player[6] = {0}, count_opponent[6] = {0};
    int i, j, k;

    // 开局
    if (count_stones(board) < 10) {
        for (i = 0; i < BOARD_SIZE; i++) {
            for (j = 0; j < BOARD_SIZE; j++) {
                if (board[i][j] == player) {
                    for (k = 1; k <= 5; k++) {
                        if (i + k < BOARD_SIZE && board[i + k][j] == player) {
                            count_player[k]++;
                        }
                        else {
                            break;
                        }
                    }
                    for (k = 1; k <= 5; k++) {
                        if (j + k < BOARD_SIZE && board[i][j + k] == player) {
                            count_player[k]++;
                        }
                        else {
                            break;
                        }
                    }
                    for (k = 1; k <= 5; k++) {
                        if (i + k < BOARD_SIZE && j + k < BOARD_SIZE && board[i + k][j + k] == player) {
                            count_player[k]++;
                        }
                        else {
                            break;
                        }
                    }
                    for (k = 1; k <= 5; k++) {
                        if (i + k < BOARD_SIZE && j - k >= 0 && board[i + k][j - k] == player) {
                            count_player[k]++;
                        }
                        else {
                            break;
                        }
                    }
                }
                else if (board[i][j] == opponent) {
                    for (k = 1; k <= 5; k++) {
                        if (i + k < BOARD_SIZE && board[i + k][j] == opponent) {
                            count_opponent[k]++;
                        }
                        else {
                            break;
                        }
                    }
                    for (k = 1; k <= 5; k++) {
                        if (j + k < BOARD_SIZE && board[i][j + k] == opponent) {
                            count_opponent[k]++;
                        }
                        else {
                            break;
                        }
                    }
                    for (k = 1; k <= 5; k++) {
                        if (i + k < BOARD_SIZE && j + k < BOARD_SIZE && board[i + k][j + k] == opponent) {
                            count_opponent[k]++;
                        }
                        else {
                            break;
                        }
                    }
                    for (k = 1; k <= 5; k++) {
                        if (i + k < BOARD_SIZE && j - k >= 0 && board[i + k][j - k] == opponent) {
                            count_opponent[k]++;
                        }
                        else {
                            break;
                        }
                    }
                }
            }
        }
        for (k = 1; k <= 5; k++) {
            score_player += score[player - 1][k] * count_player[k];
            score_opponent += score[opponent - 1][k] * count_opponent[k];
        }
        return score_player - score_opponent;
    }

    // 中后期
    int max_score = -INF, min_score = INF;
    int i, j, k;
    for (i = 0; i < BOARD_SIZE; i++) {
        for (j = 0; j < BOARD_SIZE; j++) {
            if (board[i][j] == EMPTY) {
                board[i][j] = player;
                int s = evaluate(board, opponent);
                if (s < min_score) {
                    min_score = s;
                }
                board[i][j] = EMPTY;
                if (min_score <= max_score) {
                    return max_score;
                }
            }
        }
    }
    return min_score;
}

在开局阶段，使用了一些预定义的得分来评价每个位置的价值。对于每个玩家，分别计算出其在每个方向上连续的棋子数，然后根据预定义的得分进行加权求和。在中后期，使用alpha-beta剪枝算法进行搜索，计算出当前玩家的最大得分和对手的最小得分，然后返回两者的差值作为当前局面的评分。