8 Mutually Non-Attacking Queens on Chessboard
Theorem
On a standard chessboard, it is possible to arrange a maximum of $8$ queens so that no queen is attacking any other queen.
There are $12$ such arrangements, up to rotation and reflection.
Proof
No doubt we will eventually progress to chess problems of various styles.
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Sources
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $8$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $12$
