After nearly seven years, the successor of nim-chess4 is finally available:
https://github.com/StefanSalewski/salewski-chess
The engine is tiny, simple and fast. A minimal GTK4 and GTK3 frontend is available.
Feel free to create a GUI frontend with your favorite toolkit.
Great work! Well done! :)
I'll definitely have a better look into the code!
I've been a lifelong chess addict (and created some 2-3 chess engine - horrible, all of them - at some point), so... I do get the thrill!
Have you tried calculating its ELO or having it play with other engines?
In any case, very well done again! :)