code:

interface IMoveLogic
{ // Generic interface for move logic types. Basically a parent
  // to RandomMove, etc.
   public GetNext();
}

// The colon (:) denotes that this inherits (is a child of) IMoveLogic. 
// This type of IMoveLogic moves the ghost in a random way
class RandomMove : IMoveLogic
{
   public GetNext()
   {
      // Code for a random move goes here
      return (some randomly determined move);
   }
}

// This type of IMoveLogic moves the ghost in a targeted way
class TargetedMove : IMoveLogic
{
   public GetNext()
   {
      // Some code goes here
      // Figure out where the player is, and return the move that brings us closest
      return (a move targeting the player);
   }
}


// Our base ghost class. It handles all the stuff that is the same between Inky, Blinky, Pinky, and Clyde. 

class Ghost
{
   // Calling this method you can pass in a random move or a targeted move
   // That way you can change the way the ghost moves without having to create a whole new ghost for each type of movement.
   public void SetMoveLogic(IMoveLogic newLogic)
   {
       moveLogic = newLogic;
   }

   public void Update(GameTime gameTime)
   {
      if (isAtCorner)
      {
         newDirection = moveLogic.GetNext();
      }
   }

   public void Draw();

   IMoveLogic moveLogic;
}