EvBot

The whole separate "robots" directory thing is not for no reason: In order to avoid conflicts between the running instances, I'm pretty sure one needs a separate "robot.database" file, and separate ".data" directory inside it. Unless I'm missing something, without modifying the robocode engine a little there's probably no way to do that with (sym)links, except by creating a link for each and every jar file, which would be a touch silly in some ways.

To improve that without symlink-spam I see one of two possible approaches:

1. Modify the robocode engine to separate the "robot.database" and ".data" directories from
2. Modify the robocode engine so it'll read jar files nested in a folder in the "robots" directory (thus allowing a simple symlink to a central robots directory)

For this purpose, personally I'd lean toward the first option simply because symlink APIs/commands are slightly less cross-platform (though I'd personally also not mind #2 supported for other reasons)

I think it is sufficient to make an empty robots dir for each thread to be run and add the robots directory location from the master copy to botsDirs variable in the roborunner.properties file. It is hinted in one of the readme, but took me a while to understand that this is sufficient.

On first run engine will recreate robot.database for each of the threads.