Can you crack the face-down card game?

From Standup Mathematician.

You can enter the submittable part of the puzzle at https://www.think-maths.co.uk/maths-puzzles

I wasn’t kidding, this is where almost all of my t-shirts come from:
https://ugmonk.com/collections/mens

Thanks to my co-host Matt Parker.

Huge thanks as always to my principle channel sponsor Jane Street!
https://www.janestreet.com/

And much thanks to Deanna and Oliver who are now helping us run Matt Parker’s Maths Puzzles. Deanna is making the massive sacrifice of giving up her place near the top of the leader board!

CORRECTIONS
– Nothing yet. Let me know if you spot anything!

Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset:

Sarah Gerweck
Baadrix
Derek Chandler
Fernando Gaete F.
Brandon
Alan Flett
Richard Fourie
Elaine Hewitson
Ahmed Hindawi
Alan McNea

Support my channel and I can make more videos:
https://www.patreon.com/standupmaths

Filming and editing by Matt Parker and Matt Parker
Music by Howard Carter
Design by Simon Wright

MATT PARKER: Stand-up Mathematician
Website: http://standupmaths.com/
US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/
UK book: https://mathsgear.co.uk/products/5b9fa76f230ffa140094dc43
Nerdy maths toys: http://mathsgear.co.uk/