As I recall, Paaslow was developed after this and did quite well: <a href="https://webdocs.cs.ualberta.ca/~jonathan/publications/ai_publications/solving.pdf" rel="nofollow">https://webdocs.cs.ualberta.ca/~jonathan/publications/ai_pub...</a> and <a href="https://academicworks.cuny.edu/cgi/viewcontent.cgi?article=1181&context=gc_pubs" rel="nofollow">https://academicworks.cuny.edu/cgi/viewcontent.cgi?article=1...</a><p>Problem now is it was, as I recall, 360 assembler which presents sort of a porting problem.