Rock Paper Scissors おにに

[themonk]

In the classic song, Rock Paper Scissors, towards the end, it says:

あらあら どなた そのはさみ
はさみがおににきまった

What does おにに mean here? Thank you.

[SomeCallMeChris]

So, I can't see any way that line can be anything other than,
はさみ　が　おに　に　きまった

I don't know in what variation of じゃんけん the 'paper' is called おに, but there's no other explanation I can see, as simple as that song is.

[Hektor6766]

鬼 (oni) is the "demon, ogre" or "it" in games like tag, etc. Seems at this point in the song, scissors decides who is "it".

[SomeCallMeChris]

I don't think so, but I'm not sure.

I looked at like this, that the song is like
'A tie... repeat... how many times... a tie... repeat... how many times... who threw scissors!?' and then the line in question.

The grammar looks like the use of 決まる as to win/score/hit.
'Scissors beats oni!'

１、じゃんけんぽんよ　あいこでしょ
　　あらあら　だめよ　もういちど
　　じゃんけんぽんよ　まだだめよ
　　なんべん　やっても　きまらない

２、じゃんけんぽんよ　あいこでしょ
　　あらあら　だめよ　いしかみじゃん
　　あらあら　どなた　そのはさみ
　　はさみが　おにに　きまった　


I suppose it -could- be that they are playing junken to decide who's it for tag. But I would expect the particles to different in that case.

There's probably a commented version somewhere but I'm going to bed rather than search for it tonight.

[Hyperworm]

Particles look fine to me.
Hektor6766's interpretation is correct, except for a small complaint about the translation/interpretation of "scissors deciding".
It's 決まった, not 決めた -- we don't have something 決めるing something else.

決まった : [something is/has been/was] decided / determined / fixed.
鬼に決まった : [something is/has been/was] decided on as "it" / determined to be "it" / fixed as "it"

はさみが鬼に決まった :
(The person who threw) Scissors is (the one who is)* decided on as "it" / determined to be "it" / fixed as "it".

*this part due to the emphasis of が