Feature Request: Filter Puzzles by Opening

It would be useful to filter puzzles by opening so I could practice opening puzzles specifically for openings in my repertoire.

I suggested this too before, I think it's a great idea.

Interesting idea!

How about doing it out of lichess?

Since the lichess puzzle database is open (database.lichess.org/#puzzles) and each puzzle links to the original game, it would be possible to do it as a side project without even needing to worry about API quotas.

This is a great idea. It is possible to do it on chesstempo, but it is a feature you must pay for. The new lichess puzzle system is great. Being able to filter the puzzles by opening would make it absolutely amazing!