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Year are 2023. I forgot to change it. Timetables are for this year obviously.

No need at all for now to generate new. We will start with timetable you provide from monday. You can see how I put results for teachers and students on www.yuche.tk.

So I tried to recreate liviub5.fet and only success with manual entering generator key in program, and got solution for 25 minute. So this is 3 time longer then on your PC (8 minutes). This mean that if You used 1 hour for multiple timetable that I must use 3 hours to expect to get some solution. And as I understand you got only 3 finished timetable in 100 generated. I will now try to start it multiple 4 thread in 3 hours each to see what I will get.

Not for now. I will make public timetable and wait to see if teacher can notic any big mistake in entering data. If there is a problem I will contact you here. I will now try to recreate your solution.

Your second file is most satisfactory. However Im unable to get any results with your original file livub.fet. I even input key from finished timetable livub_2 and stuck on 480/552. I tried multiple timetables 10 of them for 120 minutes and nothing. I have downloaded latest version 6.9.5 for win 7 that Im execute from playonlinux. I dont know why cant get any results. Thank You again for your contribution. I was working last 30 days on this version and you save me a time. Thank You again. I will contribute to project.

Hello Volker Dirr. My mail is the same. I have received your last file and keep it in my inbox. When I got sufficient time I will translate it. However feel free to send me latest version and I will translate it but dont expect it to be fast because this year I have 30 school periods per week and I have administration of one Students Year.

I will inspect timetable. So far I saw one error. Willing to contribute in next few days. I have also contributed with translation of TiTiTo to serbo-croatian language.

UPS misunderstanding. You didn get me right. Room INF is very important because students teach computer science. I have change one subject Informatika 1IT from room INF to K5 and KRiI and didnt get good results. However I have maximaly relaxed constrains activity are not overlaping and teacher not available time and get 545/552 activity placed. Could you now look in this file, and please dont change space constrains, because it very important.
Pcloud link: https://e.pcloud.link/publink/show?code=XZ5UmWZ3jKY3UapqCzAjyDEmvJHY7Q6boi7

You are correct. I forgot to shift ID444 one hour earlier. Now Im trying to see what will hapen with generator key whit i have got 528/552. And Im trying to relax space INFORMATIKA for activity duration 2 hour. This is all I can done.

Unfortunatly space constrain are must have because that is room wit computers. I will try your solution but I think that this may not be problem because 1DTG2 I put in second shift. Still trying to get results. Thanks for your help. Waiting to see could you solve this. You may from second file delete Activity must not overlap and try.

Yes I misspelled number of activities it is 552. I could only relax some teacher are not available time but not for all because we have teacher working in another school and another city. Try to delete actvity must not overlap all off them.
Pcloud link: https://e.pcloud.link/publink/show?code=XZwTbWZ3yOXB7DPHxBSM1QKv2sODyB8zgI7
File is too big for attach.

Im 5 year user of FET timetable and so far I have been able to solve problem of difficult timetable in my school. However this year is very difficult. I have managed to came to 528/525 activity. Using same generator key and change parameter but only could get worse results. Could you please help me with suggestions with this fet file.
EDIT: Didnt find option to attach file so here is a link to pcloud: https://e.pcloud.link/publink/show?code=XZ5UmWZ3jKY3UapqCzAjyDEmvJHY7Q6boi7