Black has all his pieces + one promoted knight, and lost one pawn. To make it in 24 moves, I see following options:
- the a-pawn went to d1, capturing a pawn, a knight and the queen and promoting to knight, which then went via e3 to capture the bishop on f1. Not sure if the pawn went a5 - xb4 - xc3 - c2 - xd1 or a5 - xb4 - b3 xc2 - xd1 or a5 - a4 - xb3 - xc2 - xd1
- the white knight took the h7-pawn and by leaving made the route open for the rook to go via h5 to a5, and was later captured on f6 by the g7-pawn
- the knight from b8 went via d7 to f6 to e8
- the bishop from c8 went via f5 to capture the rook on b1, the other bishop went straight to b4
- king and remaining pawns made their fastest way to the end position
This takes exactly 24 moves for black. However, I am stuck with the order in which to make the moves, since the pawns on 5th rank would block the rook move, the pawn on d6, necessary for the knight moves, blocks the bishop route, etc...
Maybe I missed ooptions, or is there a possible sequence?