anchor.diff:      points += delta;
     }
   
  -  int getPoints(){
  +  int getPoints() {
       return points;
     }
   
  
positive.code:     int dir = rand.nextInt(4);
      switch (dir) {
        case 0:
            return left;
          case 1:
            return right;
          case 2:
            return up;
          default:
            return down;
      }
    }
  
  
negative.code:   int x;
    int y;
  
    Random rnd = new Random();
  
    Coord(int x, int y) {
      this.x = x;
  