Yes, the client can only send a "Certificate Verify" if it has a client certificate available. So this just indicates whether a client certificate is available or not and isn't directly related to the problem. When using "openssl client" with a client certificate "Certificate Verify" is included as well and the connection succeeds without issues Thanks for checking anyway. Much appreciated.

I thought it might be a TLS issue, as Wireshark showed a difference between a problem connection: 142.132.137.205 192.168.0.221 TLSv1.2 827 Certificate, Server Key Exchange, Certificate Request, Server Hello Done 192.168.0.221 142.132.137.205 TLSv1.2 1341 Certificate, Client Key Exchange, Certificate Verify, Change Cipher Spec, Encrypted Handshake Message vs a successful connect: 142.132.137.205 192.168.0.221 TLSv1.2 828 Certificate, Server Key Exchange, Certificate Request, Server Hello Done 192.168.0.221 142.132.137.205 TLSv1.2 154 Certificate, Client Key Exchange, Change Cipher Spec, Encrypted Handshake Message the difference being that for the problem connection, the client responds to the "Certificate Request" with "Certificate Verify". For a successful connection, it might be normal for Schannel to not send this back when the certificates are removed (or a user didn't have any in the first place), I am not familiar with Schannel and TLS1.2 responses.  Does the default.cfg setting verify_certificates have anything to do with the certificate request?  I've tried both true and false settings. I did try adding the certificates back one at a time, and I no longer have the problem with any certificate, if one was a problem.  It had been a long while since I connected with and older version of 0AD before upgrading to the new one.  Maybe a cache was corrupted somehow, and maybe clearing that cache (through inetcpl.msc)? may work, but I can no longer duplicate the problem to test this.  I had 9 certs, only 1 with a key, and 1 expired, but again, adding them back in did not duplicate the issue.  

Added report of hit accuracy for ranged units.  During real fights, the accuracy is around 50% ~ 60%.

Gentlemen, please focus on the subject at hand; getting lost in details and arguments is unproductive. It is true that AI makes extrapolations, but—like anything else—it can be used wisely and in moderation. Always bear in mind that this is merely a game; at best, everything is just an approximation.

Here is a 0ad channel: https://www.youtube.com/channel/UCnyOwrZI72pKKroCtKYQHjg