@LizardWizard
The pseudo-mistakes I'm referring to have nothing to do with the daily puzzle Capricornis presented as an example. I'm only speaking from my past experience, where the final blow could've been dealt with either piece x or piece y, it made no flipping difference in the end, but the computer only accepts one route. Or similar incidents where the order of threats you execute to trap the opponent's king into a mating pit is irrelevant. Even though I understood and solved the puzzle in my mind, the system still punishes me because a machine can't allow the slightest deviation.
EDIT: typo
@Mining4GldNSlvr
In those cases, I agree completely. Every puzzle should have exactly one solution.
I've heard requests for multi-solution puzzles here before, but I think the Dev mentioned that it would be very difficult to implement.
When the puzzles are generated, they are automatically engine searched up to like depth 20 or something to ensure there is only one solution. But I have seen a few times people bringing up bad puzzles that nonetheless have more than one solution that the engine doesn't see until after the second move or so. This tends to happen more often when the site is updated; every year or so.
Usually the puzzles that are bad are removed pretty quickly. I personally have played a couple thousand puzzles and I've never seen a single bad or double-solutioned one.
If I were you in those cases where a potential bad puzzle is found, I would check a few variations with the engine to make absolutely 100% sure that the puzzle DOES have more than one solution and that I'm not missing something subtle, or just not understanding it or something like that. Then you can downvote the puzzle, and maybe post it here to the feedback area.
On my old account I did something like 200 puzzles and it began to feel more and more like a betting game: What exactly does the computer define as the 'best move'? One which leads to a certain checkmate from which there's no possible escape, right? But in Capricornis' example this definitely isn't the case, so I would've lost points again, simply because I didn't know what to look for in that specific puzzle. If you speak the truth and in all these thousands of past puzzles you never found an incongruity even once, this leaves me even more frustrated.
I've got to suck at puzzles, that's it, I guess. They're not fun for me (on lishogi, in this environment), because I feel like getting constantly whipped when I just want to improve. And that's all from me on this upsetting topic.
You can't post in the forums yet. Play some games!