Puzzle sources

I noticed that about half the puzzles in lishogi come from sources outside games, unlike in lichess. In particular, I noticed a lot of them come from yaneuraou.yaneu.com.

Where are the puzzles from yaneuraou sourced from? I couldn't find information on that website (which if I understand is the engine that's used here). Are their puzzles publicly available on their website as well?

1

Lichess.dev is temporaily disabled

1

Ыщщщзу

Олдцдц

Юяюыюы

Яыюююю

Around the time of lishogi.org/blog/post/YGnoHhIAACAAX9bs there was an announcement about an enormous collection of puzzles generated by YaneuraOu.

1