For example, single deck blackjack uses one deck, while other versions like Double Exposure may use multiple decks, which can affect the rules and odds.
https://www.ww2.site/forum/viewtopic.php?t=52736
http://mirosovak.edoras.cz/viewtopic.php?f=3&t=497857
http://biopharmamash.com/viewtopic.php?t=2009730
https://my-mobile.eu/viewtopic.php?t=21498
http://biopharmamash.com/viewtopic.php?t=2024164
http://www.lada-xray.net/showthread.php?p=253775#post253775
https://catrachosporelmundo.com/index.php?topic=5594.new#new
https://talkingpoints.org/subx/showthread.php?tid=91044
https://my-mobile.eu/viewtopic.php?t=65083
https://muchroom.ng/index.php?topic=124752.new#new
https://muchroom.ng/index.php?topic=85777.new#new
http://wirtualnapolityka.cba.pl/showthread.php?tid=3914
http://horsecity.ru/phpBB3/viewtopic.php?f=25&t=486580
https://talkingpoints.org/subx/showthread.php?tid=52171
https://planeswalkers.org/viewtopic.php?t=69167
https://catrachosporelmundo.com/index.php?topic=7447.new#new
http://www.lada-xray.net/showthread.php?p=220882#post220882
https://catrachosporelmundo.com/index.php?topic=20346.new#new
https://talkingpoints.org/subx/showthread.php?tid=50282
http://www.lada-xray.net/showthread.php?p=286016#post286016
https://www.ww2.site/forum/viewtopic.php?t=400467