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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] Kay Dekker wrote on 2010-04-23 UTCGood ★★★★
Not such an old problem, actually: the earliest reference to the eight queens problem that I have been able to find is by Max Bezzel in 1848.