Here's the chess.com forum about it with some history on the puzzle. Here's a video on YouTube explaining the solution.
unsignedinteger:
The solution: 1. d8=Q Nf7+ 2. Ke6 Nxd8+ 3. Kf5 e2 4. Be4 e1=N 5. Bd5 c2 6. Bc4 c1=N 7. Bb5 Nc7 8. Ba4 Ne2 9. Bd1 Nf3 10. Bxe2 c4 11. Bxf3#
posted 3856 days ago