Vote to bring back Opening puzzles (or slider system)

Puzzles are the talk of the hour: the "other" chess site has a fast-paced version gaining some traction these days.

Lately, I think the puzzle quality on lichess is on a rise—which is awesome—but I would love to have more freedom in choosing the stage of the game these puzzles occur.

I was even thinking about a slider representing the typical duration of a game. Placing it to the very left will give you opening puzzles, toward right side will give you end game puzzles.

Does this sound doable or interesting to anyone else?

A quick mock-up:

+1 Opening training was fun, even if the engine-generated solutions weren't always the greatest.

Hoping for a feature like beta.chesstempo.com/opening-training/ here.

Here is a open source project for opening training:

listudy.org/

I enjoy this
tailuge.github.io/chess-o-tron/

The thing about openings is that you cant really make puzzles out of them a lot of times (especially in the very early stages), but in some cases you can. The reason is because there is typically more than one developing move in the opening phase. When you use the term "puzzle" do you want there to be only one solution or multiple solutions possible?

Typically when i try to learn openings, I get frustrated that there is more than one correct move possible. If you make an opening repertoire, typically you want to limit the amount of candidate moves possible, but this annoys the heck out of me because it seems like there is something missing in this kind of studying, and it probably involves the fact that I don't know which middlegame position I want out of the opening.

#4 It would be great if listudy.org supported Lichess logins. When I'm less burned out I'll give that a shot...

@Toadofsky

Hi, I am the creator of that site. May I ask why you would prefer Lichess logins? I thought about adding it, but I didnt see a reason why somebody would prefer it. So I am curious why you prefer it.

@ArneVogel That's a good point, some people might not prefer using Lichess authentication (which can be more limiting than having a separate account).

I prefer it:
* out of some hope of linking accounts, to make it easier to import and bookmark opening studies (and maybe someday have opening studies automatically recommended somehow)
* out of laziness (not wanting to have to maintain separate passwords)

@Toadofsky I will maybe add a way to automatically import studies outside of logging in with Lichess authentication in the future. As for managing passwords I can suggest using KeepassXC for that: keepassxc.org/

Also if I have feedback after trying the site out you can post the feedback here: lichess.org/forum/general-chess-discussion/beta-release-of-listudy