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A crowd of knights (Posted on 2013-01-14) Difficulty: 3 of 5
What is the maximal number of Knights you can place on a chessboard in a way that none of them can capture any other in one standard Knight's move?

See The Solution Submitted by Ady TZIDON    
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Some Thoughts possible spoiler | Comment 1 of 3

The possibility below has 20 knights, marked by asterisks.
Each square of the board either has a knight or is under attack.
It might be possible to get more knights on the board if more squares are made to be under attack by more knights than at present, so I can't prove this is maximal.


* * - - - - * *
* * - - - - * *
- - - - - - - -
- - - * * - - -
- - - * * - - -
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* * - - - - * *
* * - - - - * *

  Posted by Charlie on 2013-01-14 17:07:02
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