def urbanmain() = {+
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  import M4._+
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+
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  val b2 = Board(Set(King(2, Red, (4,2)), King(2, Wht, (7,1)),+
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                     Pawn(3, Red, (6,1)), Pawn(2, Wht, (8,4)),+
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                     Pawn(4, Red, (4,4)), Pawn(2, Wht, (4,1)),+
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                     Pawn(4, Red, (5,3)), Pawn(3, Wht, (8,7)),+
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                     Pawn(3, Red, (6,5))))+
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+
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  assert(protectedN(Pawn(2, Wht, (8,4)), b2) == 1)+
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  assert(protectedN(Pawn(4, Red, (5,3)), b2) == 3)+
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+
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}+
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