8 Mutually Non-Attacking Rooks on Chessboard
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Theorem
On a standard chessboard, it is possible to arrange a maximum of $8$ rooks so that no rook is attacking any other rook.
There are $5282$ such arrangements, up to rotation and reflection.
Proof
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Sources
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $5282$