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No credit for mate in 5 instead of mate in 4

Recently I tried this puzzle:
http://en.lichess.org/training/20318
and saw the motif Nf6+ leading to mate. No credit. Because it takes a whopping one move more to checkmate. Interesting that lichess puzzles are so strict. In some ways, I appreciate having to see everything and trying for the absolute best and quickest way to win. I may lose points, but I learn something. On the other hand, it can be frustrating to not get credit for something that wins just as well, one more move not likely mattering in a practical game.
#2 and that's what "Good move but you can do better" should be used for more often but isn't. Lots of puzzles have this problem, but from the looks of things it won't change so it's not something I discuss any more.
<Comment deleted by user>
Yup, I came to the same conclusion #3. After making about 30 posts about this subject, I'm pretty well done. It seems the puzzles were just a grand experiment that are "good enough" to keep but not worth the time to develop further despite all the flaws in their consistency of handling these situations.

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