https://bugs.winehq.org/show_bug.cgi?id=45288
--- Comment #1 from David dav75uk@yahoo.co.uk --- Note the workaround here is to keep opening the activation window until you can see an example with 4 letters. This took 10-15 attempts when I tried it. The annoying thing is chessbase will shutdown on you though meaning you'll have to restart several times until you get a captcha you can see.