On the 4x4 board below, two white and two black queens are placed so that no queens of one color attack any queen of the other color.
Find a way to place 9 white queens and 9 black queens on an 8x8 chessboard in a similar fashion.
Using X and O for black and white:
. . . O O . . .
. . . O . . . O
. . . . . . O O
. . . . . O O O
. X X . . . . .
X X X . . . . .
X X . . . . . .
X . . . . . . .
with 9 O's and 8 X's.
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Posted by Charlie
on 2008-03-25 10:18:36 |
Almost, but not quite
