Arrange all 8 chess pieces of one set (no pawns) on a 5x6 board so no piece attacks another. Never mind that they're all the same color--it's "friendly fire". Be sure that the two bishops are on opposite-colored squares. There are 6 ways, not counting reflections and rotations.
(In reply to Not clear
Yes, the 8 pieces (not pawns) of one-colored set: 2 rooks, 2 bishops, 2 knights, 1 queen and 1 king.
Posted by Charlie
on 2003-03-03 16:29:20