E.g. on Code Golf, there is a sandbox where people post their posts first inside there for people to review and see if it's interesting before the user posts it. Does Chess.SE have something like this?
1 Answer
No, like most sites in the network we don't have one. On most Stack Exchange sites, it's pretty straightforward to ask a decent question; there's plenty of guidance in the Help Center. On Code Golf, questions have all kinds of written and unwritten requirements, that's why they decided to have a Sandbox. IMHO we don't need one here.
We do have another kind of Sandbox: the Replayer Sandbox, because that's a unique Chess Stack Exchange feature and it's good that you can experiment with it somewhere (other than the preview window).