I enjoyed this problem a lot when reading SICP book: https://billthelizard.blogspot.com/2011/06/sicp-242-243-n-queens-problem.html https://billthelizard.blogspo

I enjoyed this problem a lot when reading SICP book: https://billthelizard.blogspot.com/2011/06/sicp-242-243-n-queens-problem.html https://billthelizard.blogspot.com/2011/06/sicp-242-243-n-qu... Lisp'y example is as usual pretty elegant.