IndexError

Level 1 of the Dungeon
(0, 0, D:1)
  a +0 chain mail
(4, 19, D:1)
  a deep dwarf skeleton
(5, 7, D:1)
  a deep dwarf skeleton
(9, 17, D:1)
  a deep dwarf skeleton
(10, 15, D:1)
  a deep dwarf skeleton