♣♣♣♣♣♣♣     
  ♣♣♣.....♣♣♣   
♣♣♣.........♣♣♣♣
...............♣
 ♣.....D.....♣  
 ♣...........♣  
 ♣♣.........♣♣  
  ♣♣♣.....♣♣♣   
    ♣♣♣♣♣♣♣