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Improving lichess: Puzzles/Training feature

I'm going to be posting a series of forum posts here detailing issues that, if addressed, can help lichess be better than it already is. It goes without saying that lichess is a great site to play on, so please take this as constructive feedback. The site would draw in more traffic if some of the following suggestions are implemented:

1. Allow moderators to permanently delete ambiguous/unsatisfactory puzzles. Hell, I volunteer to do this for free as there are so many inconclusive puzzles that I would love to remove. It is a pet peeve of mine to waste time on faulty puzzles.

2. Create a search page where you can search for tactics by various filters (Pin, Skewer, Sacrifice, Mate in 3, problem number, level of difficulty, aesthetics, correct/incorrect, etc). Members would be able to search by what they are strong and weak at.

3. Allow a traceable comment section to be included below each puzzle. I want to leave feedback on many puzzles, but can't at the moment. Leaving lines in the game room, where the puzzle was derived from, isn't a real comment section. Also, I wouldn't know if someone responded to a comment in the game room chat if they tagged me. Chat room tags don't leave me a ping.

On a side note, can we can make our lichess "timeline" a bit more expansive than this?

URL:lichess.org/timeline

4. Allow users to set an optional time limit to solve puzzles within an alotted time period.

All of these features are apart of chesstempo already. There's a reason why everyone raves about chesstempo's tactics trainer: It works well.

I know nothing about the backend of lichess's design, so if a developer could step in and explain to me why each suggestion is feasible or unfeasible, I'd appreciate it.
If they are able to classify problems as you suggested in #2, it would be great if they could give you statistics on what puzzles/problems you get wrong the most so you know what areas to focus on more.

#4 would also be a nice addition but perhaps keep the puzzle rating separated so you can have for example one where the emphasis is solving the problem and one where you test your problem solving against the clock.
Those are great ideas that I really want implemented on this site, and also think that it could be great to bring more users. That said, these ideas were posted some years ago, and if I remember correctly they said they were going to be implemented, sadly, it looks like that didn't happen for whatever the reason.
The blog you posted shows how puzzles are chosen for players to solve and the attempt to make puzzles beneficial. Is there any information on the points I made earlier?

The puzzle selection has gotten better, yes, but is still far from perfect.

@Asius
"You might notice that the difficulty selector has been removed, this is for a couple of reasons. Firstly, it is not compatible with spaced repetition, but primarily this is because we plan to implement custom puzzle sets and filters. But for this to be effective we need a lot more puzzles to be able to satisfy your various training regimes. So stay tuned for that."

I also saw some forum posts on puzzles tags, describing a similar system that chesstempo have, and comments too...

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