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This is a famous problem: Place eight queens on a chessboard (an $8$ by $8$ grid) so that none can capture any of the others.
Remember that a queen can move any number of squares across, down or diagonally.
This is a good one to do outside with seven friends standing on an $8$ by $8$ grid!
Is there more than one solution?
This practical challenge invites you to investigate the different squares you can make on a square geoboard or pegboard.