Guess my sarcasm font is broken . <| sep |> Thanks for your comment and sorry for the late reply . I agree with your commentary and will include it in future reports , and will also add a clarification paragraph to the original link . Just to clarify , in the jargon of the fcsolvediscuss forum , an intractable deal means a deal for which the automated solver ran out of resources usually computer memory on the host computer before either finding a solution for the Freecell deal or concluding that no such solution is possible and the deal is impossibleunsolvable . So it is a deal for which it is still not conclusively clear whether it can be solved or not . You may be able to gain some further insights on this issue by going over the Freecell Solver ' s FAQ listsolve . shlomifish . orgfaq . html . One more update is that the last intractable deal was shown to be i m p o s s i b l e s o l v e d i s cussconversationsmessages 1491 , by running it on an AWS node with 256 GB of RAM and more hard disk space .