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.
+-----+----+----+---+---+---+---+--- --+
| W | W | W | | | | | |
+-----+----+----+---+---+---+---+-----+
| | W | W | W | | | | | | |
+---+---+---+---+---+---+---+---+-----+
| | | | | | B | B | B | |
+---+---+---+---+---+---+---+---+-----+
| | | | | | | B | B | |
+---+---+----+---+---+---+---+---+-----+
| | | | | | | B| | |
+---+----+---+---+---+---+---+---+-----+
| W | W | | | | | | | |
+---+---+---+----+---+---+---+---+-----+
| W | | | | | | | | |
+---+---+---+---+---+---+---+---+------+
| | | | | B | B | B | | |
+-- + ---+-----+--- z +---+---- +-----+
Edited on February 22, 2023, 1:12 am
Puzzle Thoughts
