List of chess variants - Wikipedia
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Chess notation - Overleaf, Online LaTeX Editor
Chess, Apple Wiki
ChessV - Wikiwand
Three-Player Chess – Green Chess
AlphaZero (And Other!) Chess Variants Now Available For Everyone
Double chess - Wikiwand
Chess960 & Fischer Random Chess Variant
Comparison of Material Power in Variant-Chess Games - Chess Forums - Chess .com
Sam Trenholme's webpage
List of chess variants - Wikipedia
Beirut chess - Wikiwand
What is your view of chess variants with a 10x8 board such as Capablanca chess? - Quora
The Classified Encyclopedia of Chess Variants, Board Game
Comparison of Material Power in Variant-Chess Games - Chess Forums - Chess .com
Apocalypse (chess variant) - Wikipedia