if (two player cells are in a row)
{
   block_a_cell();
}
else
{
  if(two player cells are in a row && there is a space to go in the next cell)
  {
     move_in_a_cell();
   }
   else if (one player cell is on its own && there are two spaces)
   {
        move_in_a_cell();
   }
   else if (there are three empty spaces)
   {
        move_in_a_cell();
   }
   else
   {
      move_in_a_random_cell();
   }
}