"zbots" is warez stuff.
if own cs:cz you play with 'csbots'.
to check it, type "bot_about" in the console, you're likely to get this info:
"The Official Counter-Strike Bot V1.50
Created by Michael S. Booth
Web: www.turtlerockstudios.comcsbot
E-mail:
csbot@turtlerockstudios.com"csbots don't use waypoints, they use nav meshes instead.
they are supposed to self-learn a map, but that sucks in most cases.
you can get information about how to hand tune nav files or request to people at
http://www.csnavcentral.combtw they got lots of navs for known custom maps.