The Keizer system can replace swiss system and full round robin tournament system in clubs and has several advantages. See there lichess.org/@/alakaluf/blog/the-keizer-system-for-club-tournaments/jZRlsKDR

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#1 I am a great fan of the keizer System and I'd love to see it implemented in lichess. During the pandemic i missed it a lot. My idea was to create a tourney to be played once a week in which those who wants to join just need to login the tourney page and say "hey, I'm available to play right now!"
I managed to implement my idea but with an external tool, in my case a great piece of software named "Sevilla" jbfsoftware.com/wordpress/category/sevilla/
Having such a pairing system implemented in lichess would be great!