Ever played Battleships??
  
 Here's how it goes. . . 
 On the grid below I have chosen places for 5 ships.
  
  
  
 A Frigate takes up 2 spaces
  
 A destroyer takes up 3 spaces
  
 A submarine takes up 3 spaces
  
 An aircraft carrier takes up 4 spaces
  
 A Battleship takes up 5 spaces
  
  
  
 None of the ships are on a diagonal
  
 Your job is to give me a co-ordinate such as A10, or G3 etc.
  
 If you get a hit I'll put a red marker.
  
 If you miss there will be a white marker.
  
 The person who "shoots" the final shot to sink a ship will win a tag - If there is more than one "hit" for a square, then the first person to have posted will get the score.
  
 So there are 5 tags to be won per game.
  
 Ready?  Then get firing . .