no prizes for guessing
US /noʊ praɪzɪz fɔr ˈɡɛsɪŋ/
UK /noʊ praɪzɪz fɔr ˈɡɛsɪŋ/

1.
当てるまでもない, 言うまでもない
used to say that something is very obvious and easy to guess
:
•
No prizes for guessing who ate all the cookies.
誰がクッキーを全部食べたか、当てるまでもない。
•
When the lights went out, there were no prizes for guessing what happened next.
電気が消えたとき、次に何が起こるか当てるまでもないことだった。