We must start and end at one of the bottom points
More from Chalkdust
Issue 14
Venn diagrams, retrograde chess, and behind-the-scenes Christmas lectures all feature in our autumn 2021 edition. Plus all your favourite puzzles & columns.
Top Ten: Waves
The definitive chart of the best waves
Piet Hein: the pirate
Did the Danish mathematician also sail the high seas?
Crossnumber winners, Issue 08
Did you solve it?
Chalkdust’s Christmas conundrums
As the festive season strikes again, we'll be dishing out more fiendish puzzles – this time with prizes!
Cat among the pigeons
Some interesting observations with the pigeonhole principle