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Thus, a solution requires that no two queens share the same row, column, or diagonal.
This puzzle has 92 solutions, but only 12 of them are unique. The other solutions can be obtained by the unique ones by symmetric operations (reflections and rotations).
It can be easy to find one or more unique solutions, but is very difficult tofind them all (without using Google of course :) ).
Tags: kosta.sokol.queens lication, eight queens problem.
The first release.