What is the least number of white knights that can be placed on a standard chessboard so that a black piece cannot be added to an unoccupied square without being under attack?

(In reply to Upper Bound by David Shin)

mine obly  goes a few less.... and there must be a more precise way to calculate it.

 

.  x .  x .  .  x .
.  .  .  .  .  . x  .
.  x .  x  .  . x .
.  x .  .  .  .  x .
.  x .  .  .  .  x .
.  .  .  .  .  .  .  .
x x  . x  x .  x .

Posted by becca on 2005-01-26 19:56:11