Insane puzzle!

en.lichess.org/training/61760

And the question is how to vote for such a puzzle?

I am guessing you mean to criticize this puzzle. The upvote/downvote system will take care of it over time.

My problem in this case is that the refutation of the second line (I don't want to give away the solution) is very long and I think impossible for any human to calculate all the sidelines in a reasonable amount of time. It is one of those cases that happen even in world championship matches where people looking at an engine's evaluation cry about the players' blunders but actually calculating the reason is not feasible.

So in this case my problem is that I don't know how to use the upvote/downvote system.The problem is correct but I don't know if it is educationally valuable.

I would like to see how people think about such a puzzle and how the downvote/upvote system is intended to be used.

Thanks for your reply!

I think I agree. I've been noticing since the puzzle switchover that many of them have long variations that are hard to calculate. I don't know if the ratings of puzzles will fix themselves over time, or if this is indicative of a systemic problem with lichess's new system.
If it were me, having a random long variation would mean that I would downvote it.

The second best line is indeed crazy and pretty hard to dismiss as not the best. But to me the puzzle should be treated like a very hard one and not bad. Probably the rating system will adjust it.

Many new puzzles are bad and too difficult. The new training system is also bad. I still don't understand why they changed the old one.
Don't change the site unless you are sure it's required!
Change for the sake of change is always a bad idea!
(Chess.com did the same thing , they changed to the AWFUL version 3 without reason!!)...

The new training system also threw me off. I miss, after losing, the puzzle allowed me to try from the place where I lost rather than having to start over from the beginning. However, I like the puzzle I lost coming back to me so I can get points back from what I learned. So tradeoffs... The new system is fine.
What I like about lichess training puzzles is:
1. They are interesting! More than the obvious look for mate-in-3 type stuff, they make one consider various scenarios that simulate real games.
2. They don't tell me the level of difficulty up-front, which can be a huge hint. There are no hints in real games!
Overall, excellent!