The circle open base is an extremly popular strategy in the Chinese community as it offers a compelling alternative to the commonly used killboxes, particularly since Tynan has shown to be not a big fan of killboxes ever since the introduction of sappers raids. The appeal of this strategy lies not just in its increasing strength with each new patch, but also in the level of game knowledge and micro-management skills required to effectively execute it. Learning and adapting this play style to your own unique approach can provide a rewarding experience.
There are several aspects that make the open base superior to killboxes like the 6 or Sap. For one, it offers protection against all kinds of raids from droppods to sappers. Moreover, its immense firepower means that it scales well into the late game, even enabling players to afk farm raids and mech bosses in the hardest difficulties. It's worth mentioning that the mastermind behind this strategy is a one of a kind masochist who has tested his methods thoroughly, ensuring the strategy's flexibility.
17 vs 20,000 threat raid (modded)
That being said, there is a caveat to this play style. The catch is that the strategy is extremely hard to pilot if one hard commit to it for challenges. Players will need to efficiently manage a multitude of resources and valuable pawns during the early to mid-game phase, all while lacking dependable protection against raids prior to having the base properly set up. That said, player are welcomed to integrate all kinds of killboxes and cheeses into the strategy to make the experience enjoyable. Note: You will probably need the "more planning mod" to help you draw circles.
The crash landed set up
Like any other Rimworld game, the starting pawns should be a miner with good socials and medicine, a doctor scientist, and crafter who's good at building. You should also select a 275*275 starting location with marble and limbstone that's close to ample alliable towns.