🧠🧠🧠 Double Vision (Lost Piece Exercise)

Lost Piece Exercise: The audio will tell you the position of most of the pieces on the board. Can you work out where the missing piece is meant to be?

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FEN for today's exercise:

1r1qr2k/p1p1b1pp/4R3/2pp4/3P4/1P3P1P/P1Q3P1/RNB4K b - - 0 1

And the answer is...

Nh4