I also posted this on a different Go forum a few months ago, I hope you all don't mind!

Tumbleweed is an abstract strategy game, designed by Polish mathematician and game designer Michał Zapała. Somehow, the rules are totally different than Go (placements are based on “lines of sight”), but somehow, a territorial game with captures emerges from the very simple ruleset. In this game, however, groups don’t always live and die together - so different notions of good/bad shape are used. I have played it now over a hundred times at the iggamecenter and I’m totally hooked. Recently, a few dan-level Go players learned the game and quickly became champions of this growing community. I love this game, and I hope to see more Go players discover its riches!

This 3-minute video explains how to play:
https://www.youtube.com/watch?v=mjA_g3nwYW4

The most recent tournament (22 players from 8 countries) was held on iggamecenter, which is the standard website for real-time Tumbleweed.
http://www.iggamecenter.com/

For those of you who prefer only correspondence play, Tumbleweed is available at AiAi and Mindsports.
http://mrraow.com/index.php/aiai-home/aiai/
https://mindsports.nl/index.php/the-pit/1092-tumbleweed

You can join the Tumbleweed community by joining our Discord or Facebook pages
https://discord.gg/6NdvbXN4E8
https://www.facebook.com/groups/376217117130000

An online interactive board can be found here:
https://tumbleweed.4tc.xyz/

PS: the game Stigmergy, and many other game designs, were inspired by the game of Tumbleweed.

This game was added to Board Game Arena if anyone is interested in trying it out.
Also, join our discord!

Just putting a reminder for everyone interested that the Tumbleweed Mind sports Olympiad tournament’s registration is now open https://boardgamearena.com/tournament?id=191540
tournament tomorrow!