Uploaded August 2025 | Updated September 2026, 2 weeks ago

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See if you have the skills to dissect this neural net: jane-st.co/SUM-MLpuzzle

More on Jane Street machine learning careers here: janestreet.com/ml

This is a complex video, so I'll try to thank and link everyone in order!

Original Numberphile video from 2015 by Brady Haran: youtube.com/watch?v=99stb2mzspI&ab_channel=Numberphile

More on the Partridge Puzzle by Robert T. Wainwright. mathpuzzle.com/partridge.html

My acrylic version of the puzzle made by Lisa Mather of qwirkshop.co.uk

Thanks to everyone at Murrayfield Indoor Sports Club who let us film and set up 45-pin bowling. They were extremely good sports. murrayfieldindoorsportsclub.co.uk

Out of the Blue is Oxford's internationally acclaimed a cappella group and total legends who arranged and recorded Nine Cube of Squaremas for me. Specific thanks to Ben Reddy who lined it up. ootboxford.com

Pete McPartlan did the animations on the 2015 Numberphile video and stepped in to reprise the role on this video.

I know Jane Street are sponsoring this video, but this is a separate shout-out to thank them for making the puzzle and inviting me to drop by the office to play with it. They're good people.

Thanks to Bec Hill for wasting vast amounts of her time trying to solve the puzzle without computer aid. bechillcomedian.com We also do a podcast together: open.spotify.com/show/7Hp5QDk9PsWyEXtcsDz34a

Here is the interactive version that Matt Scroggs made: mscroggs.co.uk/squares Scroggs also put together the code we used to count all 1,730,280 solutions.

Yes, I was at the Edinburgh Festival Fringe for all of August doing 26 shows. Which is why this video took a while to finish. Come see me on tour! standupmaths.com/shows

Huge thanks to my Patreon supporters. Insert a witty joke about their support here. patreon.com/standupmaths

CORRECTIONS
- None yet, let me know if you spot anything!

Filming by Matt Parker, Nicole Jacobus, Ayliean MacDonald, Lucie Green, Alex Genn-Bash and the Jane Street video department.
Editing by Gus Melton
Animations by Pete McPartlan
Additional animations by Gus Melton
All hats by Ayliean MacDonald
Written and performed by Matt Parker
Produced by Nicole Jacobus and Ayliean MacDonald
Music by Howard Carter and Out Of The Blue
Design by Simon Wright and Adam Robinson
Keeping track of all these names by Matt Parker

MATT PARKER: Stand-up Mathematician
Website: standupmaths.com