The rating list is the result of its members' efforts. A game played with anything other than 3 minutes per move is not counted.
All testing is done in our members' homes and on their own computers.
Also, most vendors are willing to lend us one or two chess computers for testing when a new model is released. Furthermore, we do not accept tests from people having a commercial interest in computer chess. The person responsible for managing the tests regularly calls all testers, usually once every few weeks, and collects their latest results. We have known most of the testers for many years and don't believe they would try to deceive us. Also, all testers are required to keep a written record of their activity.