In 2006 Martin Gardner asked: Can you arrange the 16 non-pawn pieces in a standard chess set on a 5 × 5 board so that no piece attacks a piece of the opposite color? As in a conventional game, the two bishops of each color must stand on squares of opposite colors.
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Cameron Byer, a second grader at Calvary Christian Academy in Harrisonburg, Va., sent this solution:
The problem was originally proposed and solved by Mamikon Mnatsakanian in Soviet Science & Life in 1976, Issue 2.
(Andy Liu, “Problem Section,” Math Horizons 14:2 [November 2006], 40-42.)
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