yamafuda o banmen ni oku.

direct object particle

Breakdown of yamafuda o banmen ni oku.

• に: target particle
• 置おく: to put
• 山札やまふだ: a draw pile; a deck of face-down cards

Questions & Answers about yamafuda o banmen ni oku.

How is 山札を盤面に置く structured grammatically?

It follows a very common Japanese pattern:

[thing] を [place] に [verb]

So here:

• 山札 = the deck
• を = marks the thing being acted on
• 盤面 = the board / play area surface
• に = marks the destination or resulting location
• 置く = to place / put

So the sentence is literally something like:

[The deck] [object marker] [on/to the board surface] [place]

Natural English: Place the deck on the board.

Why is を used after 山札?

を marks the direct object of the verb.

In this sentence, 山札 is the thing being placed, so it takes を:

• 山札を置く = place the deck

Even though English uses place X on Y, Japanese still marks X with を because X is what the action directly affects.

Why is に used after 盤面 instead of で?