GameTracker.com now scans extended server variables returned by most servers. With these variables, you can now do more advanced searches for game servers.
The list of available server variables depend on the game type and can be viewed by clicking on "Server Variables" tab your server's info page. You can also click server values directly in the Servers Variables screen to search for other servers with the same variable value!
You can now search for any variable the server returns. For example, in Call of Duty 4 you can search for 1.7 version games with this search:
Or, you can search only for servers that have a maximum of 50 player slots:
The new combinations are limitless!