Related, Oscar Toledo also made a tiny Klondike Solitaire program for IOCCC, I wonder if it was inspired by this one:

https://nanochess.org/klondike_in_c.html

https://news.ycombinator.com/item?id=48450024 - Klondike Solitaire game for curses in 5k of C (2026-06-08, 17 comments)