9th of April, 2018
Some retro problems will be published by the end of this week, I apologize to the authors for the delay in publication.
Animated diagrams use Py2Web by Dmitri Turevski and WinChloe’s graphics.
All previously published problems you can find in the subsections of Original Problems menu on the top. The next fairy tournament starts after a break, on the 1st of July (the judge: Kjell Widlert). The judge of Retro & PG problems 2017-2018: Dirk Borst.