This puzzle is the idea of Dmitry Kamenetsky in a comment of my puzzle Devouring Nobility.
Find, with the minimum number of moves, a legal game where all pieces are captured except the two kings.
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A solution in 16.5 moves exists, created by Italian composer G. Ponzetto in 2000. I found it being posted by user @AussieRookie in this chess.com thread:
1. e4 d5 2. exd5 Qxd5 3. Bd3 Qxa2 4. Bxh7 Qxb1 5. Bxg8 Qxc2 6. Bxf7+ Kxf7 7. Rxa7 Qxc1 8. Rxb7 Rxh2 9. Rxb8 Rxg2 10. Qxc1 Rxg1+ 11. Rxg1 Rxb8 12. Qxc7 Rxb2 13. Qxc8 Rxd2 14. Qxf8+ Kxf8 15. Rxg7 Rxf2 16. Rxe7 Kxe7 17. Kxf2
PGN viewer / replayer
You can do it in
20 moves with knights. From Chess Massacre Variants-Play Find The Fastest Way?. But I am pretty sure faster solutions are possible.