This is a completely unique map. This is one of the latest projects of the Counter-Strike team. It is a mostly open map in which each side starts with a jeep. This is a very early version and doesn't work very well sometimes. I have seen people get stuck in the ground, get stuck in walls, and die suddenly merely because there were too many people on it.
Many people get sniper guns and shoot down their opponents from long distances.
Get in the jeep, point it in their direction, and duck. Once you are down there, try to get them before they realize what you have done.