> Did you knew for certain that your program will solve the puzzle at some time? The description of the problem itself explains a way to verify that intermedia

> Did you knew for certain that your program will solve the puzzle at some time? The description of the problem itself explains a way to verify that intermediate results are correct. > Did you have an estimation of the date? Yes and that one is easy: I wrote a little piece of code (in Clojure, whatever, it's unrelated to finding the solution) which would check at which intermediate result the computation was and then compute an "ETA". Fun story: I'd regularly send my brother something like this... { :time-left-in-years 1.239341704718417 :eta "1 year 2 month(s) 26 day(s)" :percentage-done 0.6284244211583109 } (that's an actual estimate I found in my old emails) : )