Yup I know... There's a lot of dirt with the chrome but I still like this classic Avalon Hill game. It plays better with some revised rules and some new bits to 'juice' it up!
And guess what... Gibson Games has done most of that for you. Check out the first link below. I'm very happy about this.
Kingmaker: The Royal Relaunch from Gibson Games - This looks really good. Yay!!! I'm very happy.
Avalon Hill's Kingmaker Club - For fans of "Kingmaker" by Avalon Hill Yahoo Group - Excellent source for variants. Also contacts for fans and remote play
Board Game Geek: BGG's entries about Kingmaker
Alternate Rules Ideas - Link from (http://www.maximumawesome.com/articles/kingmaker.htm)
House Rules for a Four-Hour Time-limited Game - http://www.phys.cwru.edu/~covault/kingmaker_houserules.html
Vassal Kingmaker Module : Computer Aid for playing Kingmaker online
1994 Strategy Game (MS-DOS) - you may need to tinker to use it. Try the Easy Install method. It worked for me.
It's not half bad if your a Kingmaker fan and a great way to 'solo'...
Info and Download Page - Old Games (oldgames.com)