Antreas P. Hatzipolakis xpolakis at otenet.gr
Sat Jun 10 21:54:04 CEST 2000

Rodolfo Marcelo Kurchan asked:

  What is the smallest number of chess queens that can be placed in an n-cube
  so that all unoccupied cells are under attack by at least one queen?
  My best attempts for cubes of orders 3 to 9 are 1,4,6,8,14,20, and 24,
  respectively. Can anyone do better?
(Journal of Recreational Mathematics 21 (1989), p. 220, #1738)


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