After removing the four corner squares of a chessboard, is it possible to place a dozen knights on the remaining board so the sixty squares are under attack?
.OOOOOO.
OOOOOOOO
OOnnnnOO
OOOOOOOO
OnnOOnnO
OOOOOnOO
OnOnnOOO
.OOOOOO.
Knights are "n", empty squares are "O", corners are "."
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Posted by e.g.
on 2004-05-07 11:50:25 |