It may seam easy, but creating a simple opposed role system for a table top role playing game is not all that easy. The reason is once you start you also see all the things that it can apply to. This is what I have run into with the above three topics as they are essentially linked.
In this case I started with sensors. I wanted a system that would add a bonus to long range attacks to have combat that is beyond a set thresh hold. At the same this this led to the creation of sensor deception.
Sensor deception is an opposed roll to the use of sensor systems. For every success that the SD using targets gets. They reduce the number of successes the attacker with sensors receives. the culmination be that if the sensor tests successes are dropped to zero, the target can not accurately fire on the target.
But the applications of SD became very obvious against missiles also. So this has snow balled into multiple roles of missiles and SD. Because as a volley of missiles travels over rounds, they have a chance to reacquire a target. Thus making this entire thing VERY messy.
But in the end I will get it cleaned up some. I may just nuke the entire thought process...I am not sure yet though. In any case, that is what I am thinking at this moment. Interesting huh?