def urbanmain() = {
  import M4._

  val b_init = Board(Set(King(2,Wht,(4,1)), King(1,Red,(5,8)),
                         Pawn(4,Wht,(1,1)), Pawn(4,Red,(1,8)),
                  	 Pawn(3,Wht,(2,1)), Pawn(2,Red,(2,8)),
                      	 Pawn(2,Wht,(3,1)), Pawn(3,Red,(3,8)),
              		 Pawn(1,Wht,(5,1)), Pawn(1,Red,(4,8)),
               		 Pawn(4,Wht,(6,1)), Pawn(3,Red,(6,8)),
               		 Pawn(3,Wht,(7,1)), Pawn(1,Red,(7,8)),
               		 Pawn(2,Wht,(8,1)), Pawn(3,Red,(8,8))))

  val pw_a = Pawn(4, Wht, (4,4))
  assert(eval(pw_a, U,  4, b_init) == Set(Pawn(4,Wht,(4,8))))
  assert(eval(pw_a, U,  3, b_init) == Set(Pawn(4,Wht,(4,7))))
  assert(eval(pw_a, RU, 4, b_init) == Set(Pawn(4,Wht,(6,6)), Pawn(4,Wht,(4,8)),
                                          Pawn(4,Wht,(5,7)), Pawn(4,Wht,(7,5)), 
                                          Pawn(4,Wht,(8,4))))
  val pw_b = Pawn(4, Red, (4,4))
  println(eval(pw_b, RU, 4, b_init) == Set(Pawn(4,Red,(8,4)), Pawn(4,Red,(7,5)), 
                                           Pawn(4,Red,(6,6)), Pawn(4,Red,(5,7))))


}