Pointing to multi-Dimensional arrays

int main(void)
{
    //num[0]stands for 'a' on the board in ascending order
    //example num[1] == 'b' or num[2] == 'c'     
   //and num[][0] is for the numbers and so on.
    string num[9][9];
    num[0][0]="a1"; string a1 = num[0][0];//pointers//
                          string* p1 = &num[0][0];
    num[0][1]="a2"; string a2 = num[0][1];
                          string* p2 = &num[0][1];
    num[0][2]="a3"; string a3 = num[0][2];
                          string* p3 = &num[0][2];
    num[0][3]="a4";//and you get the point im sure.
    num[0][4]="a5";
    num[0][5]="a6";
    num[0][6]="a7";
    num[0][7]="a8";
    cout<<" Enter a place \n";
    cin>>?<=something to input to reference num[][];
    system("PAUSE");
    return 0;
}

void main()
{
  // Create the board
  CBoard board(8,8);
  char cFrom[10], cTo[10];

  // Ask the user the move
  // e.g. cFrom => "a7"  and cTo => "c1"
  // Calculate to integers
  int x1, y1, x2, y2;
  
  board.Convert(cFrom, x1, y1);
  board.Convert(cTo  , x2, y2);
  board.Switch(x1, y1, x2, y2);

}


class CPiece
{
  CPiece(int Type=0)
  {
    m_Type=Type;
  }
  
  int m_Type;
}


class CBoard
{
  CBoard(int xS, int yS)
  {
    for(m_y=0; m_y< yS; m_y++)
    {
      m_board[m_y] = new CPiece[];
      for(m_x=0; m_x< xS; m_x++)
      {
        m_board[m_y][m_x] = new CPiece(x);    // Set a 'piece' on the board
      }
    }
  }
  
  ~CBoard()
  {
    int x, y;
    for(y=0; y< m_y; y++)
    {
      for(x=0; x< m_x; x++)
      {
        delete m_board[y][x];
      }
      delete [] m_board[y];
    }
  }

  void Convert(const char *cPlace, int &x1 int &y)
  {
    x = cPlace[0]-'a'+1;
    y = cPlace[1]-'1'+1;
  }

  void Switch(int x1, int y1, int x2, int y2)
  {
    CPiece *p = m_board[y1][x1];
    m_board[y1][x1] = m_board[y2][x2];
    m_board[y2][x2] = p;
  }
  
  CPiece ***m_board;
  int m_x, m_y;
};