It is tough, I never solved it.
Nobody has pulled me up yet about the picture of Gibraltar...It's not Gibraltar.
I often sneak in things like this in the blog. Here:
Blog Post 372
I claimed there was a picture of Morphy on the wall in the film,
It's not (sadly) I took a copy the frame and doctored the picture.
There are others (most likely appearing as fact somewhere else on the net.)
I have to be careful because some people do not know when I'm joking.
See: Blog Post 436
Now go to the very bottom of the page here:
The 'falsehood' appeared here - not on the English Chess Forum. (I'm infamous!)
Hope Mr.Winter is OK. His site has mention from March 2020 it was being 'curtailed.'