It does not say that the result should be None, that is never possible for valid input. It says something other than that and you're paraphrasing such that the difference is lost.

When [3, 1, 2] the result must be [3] and not None as the "attempt" suggests.

Approved by someone

This one was funny and interesting. Not that straightforward as some 7 and 8 kyus, but still doable.
As another commenter said, it would be cool to see other humorous sorting katas.

Good kata! It was more challenging than it appeared at first, but still solvable.

Cool kata!
I've been having fun with this series; I appreciate that you split up the stages into smaller, simpler problems.

Cool kata!
It took me a lot of thinking, and some reading and trial and error before I managed to make it work.

Great kata!
It was an interesting problem to solve. At first I was bit confused with the description and examples, but I figured it out.

The reference solution in C (probably also in C++ and NASM) uses the non-portable and nonstandard integer type __int128 to store intermediate results without overflow. This is an issue because solvers should be warned that the solution requires a feature outside of the C standard. As it stands, the kata is unfair for those who are not knowledgeable about compiler extensions.

This was a very interesting kata. Great job creating it!
My first solution was not efficient and it forced me to rethink my approach.

There are errors within C++ - ATTEMPT.
Given the Testcase:
Assert::That(countPatternsFrom('E', 8), Equals(23280));
I encountered the Case:
('E', 9) within the random section, which wouldnt be a problem if it would not also want 23280
as the Result ...

The same problem (within the random section) goes for every Startingpostion having a targetdepth of 9.
For those I dont have proof that it isnt my fault ... but the case above shows that someone needs to take a look into it.

Interesting kata.

I got it, it needs to be in order or reversed order. Just finished it . thanks

(it's rather the car driving the other way around, I believe)