# Backtracking issue on fail **URL:** \ **Category:** Help!\ **Created:** [September 12, 2020, 4:31am UTC](https://swi-prolog.discourse.group/t/backtracking-issue-on-fail/2921 "2020-09-12T04:31:56Z")\ **Posts on this page:** 1\ **Showing post:** 3
**Author:** ![moraneus](https://avatars.discourse-cdn.com/v4/letter/m/a3d4f5/32.png) [@moraneus](https://swi-prolog.discourse.group/u/moraneus)\ **Post date:** [September 12, 2020, 6:53am UTC](https://swi-prolog.discourse.group/t/backtracking-issue-on-fail/2921/3 "2020-09-12T06:53:42Z")
I tried to explain in another post of mine, but I opened a new one. **Here is the refernce** > [@Coding problem](https://swi-prolog.discourse.group/t/coding-problem/2897/22): > > Further to your help, I was tried to do something like this. First of all, thank you for your detailed answers and your patience, I learn a lot from this. slightly_smiling_face I have this problem that my output is duplicated to many times instead to print one time HERE I know this is not like you told me, I will fix it at the end, according to your explanations. In my code I have few facts and then I want to check if x\_lt\_y for all y If is true, I want to print an HERE and then stop w… Assume I have some facts that if they happened, It should fail (like blacklist of facts). I want to check for the new fact that I entered if it in the blacklist. But now, for this new fact, I have a few checks that should made be done. So it is important for me to find all failures. --- _[View the full topic](https://swi-prolog.discourse.group/t/backtracking-issue-on-fail/2921)._