🧠🧠 In Passing (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:

4r1k1/p4p1p/1p4p1/2p1n3/2P1pN2/1P2P3/P5PP/5R1K b - - 0 1

And the answer is...

d4 and White's last move was d2-d4