I'm looking for ideas through to detailed descriptions on how to live stream the top two boards of a tournament, ideally to the same site (preferably YouTube)

If it is easy please explain to the thicko using short words.

Refine your question.

For example, are you meaning "on one computer" and if so, is this a computer capable of supporting multiple simultaneous users?

The EASIEST approach (likely you do NOT have a computer system supporting multiple simultaneous uses) is to use two computers set up side by side. For example, more than one laptop in my household.

Thank you for replying, I apologise for not being more clear. Multiple users on one computer is the easy bit. It was youtube or similar that was the focus of my enquiry

If you're looking to have both camera feeds showing on the same Youtube stream, then you'll presumably need to use some software like OBS. I'm sure there are others but here's the first tutorial I found:
https://www.youtube.com/watch?v=lnxWXuwtkRM

If you're looking to have them on separate streams, then I think it is possible to have two or more concurrent streams on the same Youtube channel.
https://www.reddit.com/r/youtube/commen ... s_at_once/

thank you, I'll investigate