The wiki diagram and the chess.com diagrams for 'rule of the square' don't look that great.
Maybe there's a youtube for it.
The Magnus vid on it looks pointlessly complicated to me. And too particular.

While searching discovered this wonderful video by Igor Smirnov regarding Fischer's rule which indicates that if your opponent has a piece in your half of the board its a good idea to neutralize it.
https://www.youtube.com/watch?v=_h4KLNqvLWw

But! - found a good vid on Square of the Passed Pawn by National Master Ramirez.
Here:
https://www.youtube.com/watch?v=glLDHDxP9IYNeat. Simple. Well explained.

Kings gambit 4 all

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