There is kind of a workaround for *privately* annotating a game while in play. The Admins have this request on their to-do list, but this will work for the time being. Your comments are definitely welcomed on this idea.
The short answer: create a blog entry with the PGN of your current game (which should also contain any comments you have inserted via the Chess Wizard), click Save and Preview (
don't publish), and then revisit it in that draft mode to update it. The following shows how you do this.
The details: Go into your blog, and create a new post. Once that comes up, you can click on the small brown and white checkerboard icon (
) and insert the PGN of your game so far (this whole mini-tool that allows you to do this is called the "Chess Wizard" and will henceforth be referenced as such). Add any comments you want where prompted to do so, and click "Insert" in the Chess Wizard when all finished (if you have questions on how to use this cool tool, let me know -- it is very helpful). You can now click Save and Preview in the blog -- the next screen will contain a box at the top that looks like this:
DON'T CLICK any of those buttons, for at this time, your blog has been saved but not published, therefore making it a private blog. Now, if you were to click the "My Home" button, then look at the 4th(?) box down that's titled "My Latest Blog Post". Look on the right-hand side of that box and click the "manage blog" button (note: screenshot below edited for length -- this box is actually further down than portrayed here).
That will give you a list of all your blogs, and will include the unpublished ones as well.
To edit the chessboard on your post (e.g. insert another move from your current game and comment on it), go into edit mode on that entry, click ONCE on the chessboard DIAGRAM holder in the body of the blog, then click on the little icon, and that will put you into the "Chess Wizard" application and onto that chessboard for editing.
At the end of your updates, you click "Update" (notice how the same button was titled "Insert" when it was a new entry? The system knows you are updating it...) and then the Save & Preview button again. And, once again, when the yellow box comes up, don't click any of those buttons, and you will have a privately saved blog entry that no one else can see containing all your annotations. Hope this helps!