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As usual, I'm having trouble with this particle. Here's the sentence:

> 誰にでも見られるところに堂々と張り出し、私たちの知恵 **に** 挑戦する。

I don't understand. I would personally have written "私たちの知恵を挑戦する。". How is に
effective here? Or is it one of those special verbs that can use に ?
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grammar transitivity
What is this に in 知恵に挑戦する
「挑戦{ちょうせん}する」 is an intransitive verb; therefore, it cannot take 「を」 as the
object marker. It takes 「に」 instead.

Thus, 「私達の知恵に挑戦する」 means " ** _to challenge our intelligence_** ".

(The first part of your sentence 「誰にでもところに」 makes no sense, so I would not
attempt at translating the whole sentence. You must have miscoppied that
part.)
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This に has the nuance of the meaning of 対して, it may be close to "to" and
"for". Dictionaries say 動作・作用の行われる対象・相手を表す.

We generally say to ～に挑戦する, not ～を挑戦する. Other examples are に近づく, に乗る, に行く,
etc. Intransitive verbs don't take を as the object marker.

Of course, transitive verbs take を as the object marker as in 車を運転する.

Further, direct object takes を and indirect object takes に as in 彼にボールを投げた.
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