[AC-Phoenix]

Since doing this will no longer spoiler anything.
I wanted to look up as to whether the Novel is already available in english or not I accidentally saw the end result (Wikipedia really needs spoiler tags, or at least the general information not that close to a mystery novel's solution....)

Well, don't worry no spoilers here for people having watched until EP 10....
So yes, you can use Knox Rules after all. (Anlyzing it afterwards is a lot easier though)
it also doesn't state whether anyone here was right or wrong, so everything stays open until you either get it or Mei reveals it.

Spoiler for Another KNOX Analysis:

1.)The criminal must be someone mentioned in the early part of the story, but must not be anyone whose thoughts the reader has been allowed to follow.

We were only allowed to follow Kouichi's thoughts, he was ruled out by the fact that the calamity began before he even arrived. (EP 10)
All suspects were also introduced in the early parts of the story.


2.)All supernatural or preternatural agencies are ruled out as a matter of course.
While it goes on the Another is out of flesh and blood, does not know about their death and is thus killable (EP 10). The Rule was far stretched though.

3.)Not more than one secret room or passage is allowable.
There were none.

4.)No hitherto undiscovered poisons may be used, nor any appliance which will need a long scientific explanation at the end.
While there is a certain poison that would show similar to heart attacks, it was not used here. (Said poison does also not count as undiscovered or hard to explain anymore as it is overused) (EP 1, where he tells Kouichi that he has a heart condition)


5.)No Chinaman must figure in the story.
While I don't like this Version of rule 5 (I think Ryukishi'07's version of it is a lot better as it explains what this rule is actually about)
Fullfilled.

6.)No accident must ever help the detective, nor must he ever have an unaccountable intuition which proves to be right.
Before we go on we have to finalize who the detective actually is.
While there are two candidates (Izumi and Kouichi), the detective is indeed Kouichi.(EP 3 + 10)
Regarding Mei's eye: While her eye might count as such, she is neither the detective nor does it have any significance, the case is solvable even without it.
Don't be lead astray for future novels though, the mere fact that you are allowed to mainly follow a person's thoughts is no guarantee that they are the detective. (example: Sleeping Murder)



7.)The detective must not himself commit the crime.
Fulfilled, as he wasn't there when the first death happened.(EP 10, EP7)


8.)The detective must not light on any clues which are not instantly produced for the inspection of the reader.
Tricky one, Ryukishi's version is again better for this. ('All clues must be presented'), but yes it has been fulfilled. Everything more would be a spoiler, and I have to admit that the clues are well hidden, if not concealed to the viewer until a certain point of the story, or where even dismissed for several reasons (Episodes containing hints:<redacted> (Example: The final evidence that Kouichi is not a candidate)


9.)The stupid friend of the detective, the Watson, must not conceal any thoughts which pass through his mind; his intelligence must be slightly, but very slightly, below that of the average reader.
We do again have to clarify who the Watson is in Another.
While many would now suggest that it is Mei, logic already excludes her from that role, as she deliberately concealed all thoughts having passed through her mind, even already knowing who it is.
This is not a problem for the Knox rules btw, and that for several reasons:
She was a suspect herself for a good deal of the series, She is not the Detective/Watson, but a mere witness/suspect, and is thus even allowed to lie. (Ep 10)


10.)Twin brothers, and doubles generally, must not appear unless we have been duly prepared for them.
While unimportant, fulfilled.
We were both duly prepared for the additional Person to exist as well as Mei having had a twin sister.(EP 1 - 10)