bool is_oshi_structural(int color, pair<int, int> pt) {
    if (!is_legal_movement(color, pt))
        return false;
    const int opp = -color;
    int weak_lib_before[4];
    bool adj_opp[4] = {false, false, false, false};
    bool has_adj_opp = false;

    for (int d = 0; d < 4; d++) {
        int ny = pt.first + dir[d][0];
        int nx = pt.second + dir[d][1];
          
        if (out_of_edge({ny, nx}))
            continue;

        if (get_board(ny, nx) == opp) {
            adj_opp[d] = true;
            has_adj_opp = true;
            weak_lib_before[d] = calculate_liberty_weak_connect({ny, nx});
        }
    }
    if (!has_adj_opp)
        return false;
    add_stone(color, pt);
    if (calculate_liberty(pt) > 1) {
        undo();
        return false;
    }
    bool liberty_decreased = false;

    for (int d = 0; d < 4; d++) {
        if (!adj_opp[d])
            continue;
        int ny = pt.first + dir[d][0];
        int nx = pt.second + dir[d][1];
        if (get_board(ny, nx) != opp) {
            liberty_decreased = true;
            continue;
        }
        int weak_lib_after = calculate_liberty_weak_connect({ny, nx});
        if (weak_lib_after < weak_lib_before[d])
            liberty_decreased = true;
    }
    undo();
    return liberty_decreased;
}

bool is_oshi_structure (color, pt) 
	if illegal
    	return false
    if not adjacent to opponent
    	return false
    add_stone(pt)
    if (calculate_liberty(pt) > 1)
    	return false
    for {ny, nx} in four direction next to pt
    	if (calculate_liberty_weak_connect({ny, nx})
    

bool res = game.win_with_depth(1, 8, 0, 0, 1, 0) ||
                       game.defend_by_seki(1) || game.win_within_one_move(1);

if(end){
	// cout<<"check\n";
	//若符合其他條件，則根據主要棋塊狀態決定終局狀態
	bool state_self = alive_with_eyes(color);
	bool state_opponent = alive_with_eyes(-color);
	if(state_self and state_opponent)
		return true_end;
	else{
		if(state_self and alive_within_one_move(-color)){
			return pseudo_end;
		}
		else{
			if(is_seki()){
				return true_end;
			}
		}
	}
}