Cheating at Counter strike

In Counter Strike: Condition Zero, various levels are to be completed and each level has its challenges. The screenshot below shows the challenges for the map "Stadium" in "Hard" level. The names of the enemy bots are clearly mentioned and are actually well chosen so that the challenges are effective.The cheat is actually a loophole. The essence of the cheat is that if we change the bots that make the challenge effective, then the challenge becomes easier. The challenge counter, e.g. the number of enemies to be killed, remains the same however.

Let me take the help of an example to explain how the cheat works. Suppose in the above game I found that Razor being a sniper is causing me more problems than the other bots. So I went to the command line using '~' button. The Console appeared as shown below. I typed in the command
kick Razor
and the outcome was leaving of Razor and joining of Floyd.
Another time, in the next round when I did it Cooper joined the CT forces, as shown in the following screenshot. Each time a random bot was added to the CT forces and the match became 6 on 6 rather than 5 on 7.
The challenge counters that counted the number of kills by me were intact but the challenge lost meaning to some extent.