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Contest: the 9 Queens Problem. Put 9 queens and 1 or 2 pawns such that queens do not see each other. Send your solution before Feb 29, and win a book![All Comments] [Add Comment or Rating]
Tez wrote on Sat, Sep 5, 2009 09:35 AM UTC:
Reply to Andreas:

As for the second archbishop problem (attacking every square), I have found a solution with just eight archbishops. Archbishops on a1, b3, c5, d7, e7, f5, g3 and h1 cover all squares. I believe it is optimal, but I do not know for certain.