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I think you get it after your first stream, just try it out :D

Yes, that's possible: https://adjva4.dpdns.org/class

On windows: Click/drag with right mouse button = green circle/arrow and hold Ctrl = red and hold Alt = blue and hold Ctrl + Alt = yellow I think it works quite similar on mac, just try it out

Just drag your king onto the rook. See here: https://adjva4.dpdns.org/variant/chess960