[C++] Connect 4

#include <iostream>
#include <windows.h>

using namespace std;

int CalculateColumnSpace(int y, int x, int dist);
void Clear_Board();

    char board[11][25] = {
       "   Connect Four  ",
       "|-1-2-3-4-5-6-7-|",
       "                 ",
       " | | | | | | | | ",
       " | | | | | | | | ",
       " | | | | | | | | ",
       " | | | | | | | | ",
       " | | | | | | | | ",
       " | | | | | | | | ",
       " =============== ",
    };

int main()
{


    int pX;
    int pY;
    int checkY;
    int space;
    int player = 1;


    refresh:
        system("cls");
    for(int i=0; i<11; i++)
    {
        cout << board[i] << endl;
    }


    for(int i=0; i<11; i++)
    {
        for(int p=0; p<25; p++)
        {

            if(board[i][p] == 'G')
            {
                if((board[i][p] == 'G' && board[i-1][p+2] == 'G' && board[i-2][p+4] == 'G' && board[i-3][p+6] == 'G') || (board[i][p] == 'G' && board[i-1][p-2] == 'G' && board[i-2][p-4] == 'G' && board[i-3][p-6] == 'G') ||(board[i][p] == 'G' && board[i][p+2] == 'G' && board[i][p+4] == 'G' && board[i][p+6] == 'G') || (board[i][p] == 'G' && board[i-1][p] == 'G' && board[i-2][p] == 'G' && board[i-3][p] == 'G'))
                {
                    system("cls");
                    cout << "P1 wins!" << endl;
                    system("pause");
                    cout << "|Game Board|" << endl;
                    for(int i=0; i<11; i++)
                    {
                        cout << board[i] << endl;
                    }
                    system("pause");
                    Clear_Board();
                    player=1;
                   goto refresh;
                }
            }
        }

    }

    for(int i=0; i<11; i++)
    {
        for(int p=0; p<25; p++)
        {

            if(board[i][p] == 'O')
            {
                if((board[i][p] == 'O' && board[i-1][p+2] == 'O' && board[i-2][p+4] == 'O' && board[i-3][p+6] == 'O') || (board[i][p] == 'O' && board[i-1][p-2] == 'O' && board[i-2][p-4] == 'O' && board[i-3][p-6] == 'O') || (board[i][p] == 'O' && board[i][p+2] == 'O' && board[i][p+4] == 'O' && board[i][p+6] == 'O') || (board[i][p] == 'O' && board[i-1][p] == 'O' && board[i-2][p] == 'O' && board[i-3][p] == 'O'))
                {
                    system("cls");
                    cout << "P2 wins!" << endl;
                    system("pause");
                    cout << "|Game Board|" << endl;
                    for(int i=0; i<11; i++)
                    {
                        cout << board[i] << endl;
                    }
                    system("pause");
                    Clear_Board();
                    player=1;
                    goto refresh;
                }
            }
        }

    }


    if(player==1)cout << "Enter Column Number Player G: ";
    if(player==2)cout << "Enter Column Number Player O: ";

    cin >> space;
    switch(space)
    {
        case 1:
        pX = 2;
        pY = CalculateColumnSpace(2,pX,6);
        if(pY == 0)goto refresh;
        if(player==1)board[pY][pX] = 'G'; else board[pY][pX] = 'O';
        if(player==1)player=2; else player=1;
        goto refresh;
        break;

        case 2:
        pX = 4;
        pY = CalculateColumnSpace(2,pX,6);
        if(pY == 0)goto refresh;
        if(player==1)board[pY][pX] = 'G'; else board[pY][pX] = 'O';
        if(player==1)player=2; else player=1;
        goto refresh;
        break;

        case 3:
        pX = 6;
        pY = CalculateColumnSpace(2,pX,6);
        if(pY == 0)goto refresh;
        if(player==1)board[pY][pX] = 'G'; else board[pY][pX] = 'O';
        if(player==1)player=2; else player=1;
        goto refresh;
        break;

        case 4:
        pX = 8;
        pY = CalculateColumnSpace(2,pX,6);
        if(pY == 0)goto refresh;
        if(player==1)board[pY][pX] = 'G'; else board[pY][pX] = 'O';
        if(player==1)player=2; else player=1;
        goto refresh;
        break;

        case 5:
        pX = 10;
        pY = CalculateColumnSpace(2,pX,6);
        if(pY == 0)goto refresh;
        if(player==1)board[pY][pX] = 'G'; else board[pY][pX] = 'O';
        if(player==1)player=2; else player=1;
        goto refresh;
        break;

        case 6:
        pX = 12;
        pY = CalculateColumnSpace(2,pX,6);
        if(pY == 0)goto refresh;
        if(player==1)board[pY][pX] = 'G'; else board[pY][pX] = 'O';
        if(player==1)player=2; else player=1;
        goto refresh;
        break;

        case 7:
        pX = 14;
        pY = CalculateColumnSpace(2,pX,6);
        if(pY == 0)goto refresh;
        if(player==1)board[pY][pX] = 'G'; else board[pY][pX] = 'O';
        if(player==1)player=2; else player=1;
        goto refresh;
        break;

        default:
        cout << "Invalid Selection" << endl;
        system("pause");
        goto refresh;
        break;
    }

    exit:
    return 0;
}


int CalculateColumnSpace(int y, int x, int dist)
{
    int cY;

        if(board[y+1][x] != ' ')
        {
            cout << "Column Full" << endl;
            system("pause");
            y = 0;

        }
        else
        {
            for(int h=0; h<dist; h++)
            {
            cY = y+1;
                if(board[cY][x] == ' ')
                {
                    y++;
                }
            }
        }

        return y;
}

void Clear_Board()
{
    for(int i=0; i<11; i++)
    {
        for(int p=0; p<25; p++)
        {
            if(board[i][p] == 'G')
            {
                board[i][p] = ' ';
            }
        }
    }

    for(int i=0; i<11; i++)
    {
        for(int p=0; p<25; p++)
        {
            if(board[i][p] == 'O')
            {
                board[i][p] = ' ';
            }
        }
    }
}