Tic-tac-toe in c++

Помогите защитить клетку от перезаписи другим игроком.
И написать функцию Check(), которая проверяет выиграшные комбинации, и определяет ничью.
Буду очень благодарен!
Вот код:

#include<iostream>
#include<conio.h>
using namespace std;

#define vert_line (char)179
#define horiz_line (char)196
#define cross (char)197
#define middle "\n\n\n\n\n\n\n\n\n"


void ASCII()
{
for (int i = 0; i < 256; i++)
{
cout << i << "\t" << (char)i << endl;
}
}
void PrintField(char Field[], const int n, char Player);
void Move(char Field[], const int n, char Player);


void main()
{
const int n = 9;
char Field[n] = {};
PrintField(Field, n, 'X');
//ASCII();
}

void PrintField(char Field[], const int n, char Player)
{
system("CLS"); //Очистка экрана
cout << middle;
for (int i = 6; i >= 0; i -= 3)
{
cout.width(50);
for (int j = 0; j < 3; j++)
{
if (j != 0)cout << vert_line;
cout << " " << Field[i + j] << " ";
}
cout << endl;
if (i != 0)
{
cout.width(50);
cout << horiz_line << horiz_line << horiz_line << cross;
cout << horiz_line << horiz_line << horiz_line << cross;
cout << horiz_line << horiz_line << horiz_line;
cout << endl;
}
}
Move(Field, n, Player);
}
void Move(char Field[], const int n, char Player)
{
char key;
do
{
key = getch();
if (key == 27)return; //При нажатии Escape - выход из рекурсии.
if (key < '1' || key > '9')
cout << "Error\a" << endl;
} while (key < '1' || key > '9');
Field[key - 49] = Player;
if (Player == 'X')PrintField(Field, n, '0');
else PrintField(Field, n, 'X');
}

Code

#include<iostream>

#include<conio.h>

using namespace std;



#define vert_line    (char)179

#define horiz_line    (char)196

#define cross        (char)197

#define middle        "\n\n\n\n\n\n\n\n\n"





void ASCII()

{

    for (int i = 0; i < 256; i++)

    {

        cout << i << "\t" << (char)i << endl;

    }

}

void PrintField(char Field[], const int n, char Player);

void Move(char Field[], const int n, char Player);





void main()

{

    const int n = 9;

    char Field[n] = {};

    PrintField(Field, n, 'X');

    //ASCII();

}



void PrintField(char Field[], const int n, char Player)

{

    system("CLS");    //Очистка экрана

    cout << middle;

    for (int i = 6; i >= 0; i -= 3)

    {

        cout.width(50);

        for (int j = 0; j < 3; j++)

        {

            if (j != 0)cout << vert_line;

            cout << " " << Field[i + j] << " ";

        }

        cout << endl;

        if (i != 0)

        {

            cout.width(50);

            cout << horiz_line << horiz_line << horiz_line << cross;

            cout << horiz_line << horiz_line << horiz_line << cross;

            cout << horiz_line << horiz_line << horiz_line;

            cout << endl;

        }

    }

    Move(Field, n, Player);

}

void Move(char Field[], const int n, char Player)

{

    char key;

    do

    {

        key = getch();

        if (key == 27)return;    //При нажатии Escape - выход из рекурсии.

        if (key < '1' || key > '9')

            cout << "Error\a" << endl;

    } while (key < '1' || key > '9');

    Field[key - 49] = Player;

    if (Player == 'X')PrintField(Field, n, '0');

    else PrintField(Field, n, 'X');

}