Vertical Castling isn't real - A very odd chess myth

Clickbait title: 'Die Story ist ein Hoax!!' Thank you to all those who commented on my last video who heavily influenced this one. DISCLAIMER: This video is about a joke puzzle, though it has a serious tone and I hope you leave knowing more, this video is in no way a hit piece or attack on those mentioned. This story does not have a villain. SPOILERS: There are some sections of this that are not perfect. In particular the 1985 book does contain additional context that you can read in the video, though it does not change what I have included. There is much more nuance and discussion that can be had, but this is not the format for it. Additional Reading: 1 - Pieter De Groot (In Dutch) - https://pijpersh.home.xs4all.nl/index... 2 - German wikipedia article (also read the discussion pages) - https://de.wikipedia.org/wiki/Staugaa... 00:00 - The puzzle 02:09 - The story behind the puzzle 03:04 - The totally unexpected twist 05:24 - Some history! 08:14 - The source? 10:44 - The unintentional source 11:41 - Why did it take so long to debunk? 12:51 - Aftermath