# 8 Mutually Non-Attacking Queens on Chessboard

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## 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

## Sources

- 1986: David Wells:
*Curious and Interesting Numbers*... (previous) ... (next): $8$ - 1997: David Wells:
*Curious and Interesting Numbers*(2nd ed.) ... (previous) ... (next): $8$ - 1997: David Wells:
*Curious and Interesting Numbers*(2nd ed.) ... (previous) ... (next): $12$