12 Knights to Attack or Occupy All Squares on Chessboard
Theorem
On a standard chessboard, it is a maximum of $12$ knights are needed to ensure all squares are either occipied or under attack.
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): $12$
