Is it possible to view or obtain old versions of the FIDE Laws of Chess? I would like to trace the history of when various rules were added or modified.
The FIDE handbook only goes back as far as the 2009-2014 rules as far as I can see.
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This site appears to have old rules of chess, FIDE and otherwise
I do not attest to the accuracy or completeness of this site
The only source I know is The Retro Corner. Unfortunately, it hasn’t been kept up to date, but together with the FIDE site itself, it should give you coverage back to 1977.
The rules are hardly perfect, but there have been continual improvements in writing quality over time. Specific changes have mainly been in various kinds of draws, and filling various funny holes (e.g. Pam-Krabbé castling).
For further back than 1977, I would approach a proper chess historian. Hope this helps.