In nearly every map there are some strategic points. Every player tries to control such points. You can expect that a good player will go to this point of the map with an engineer. If you build a radar or a unit with radar you can see him coming. If your enemy's Engineer stops moving you can come with your transporter carrying a Tech 2 or Tech 3 engineer and steal his engineer. If he has a engineer same or higher tech you can carry your engineer away with your transporter. {C You should watch this carefully, or the enemy engineer will steal yours. {C This strategy has a lot of weak points.