there was a short discussion here. http://www.eclipsephase.com/skill-challenge-ep

Simplest way: chased and chaser will make a freerunning test (or Freefall, or whatever skill you deem approppiate) and the relevant factor will be the Margin of Success. What you need to prepare before the chase itself, I think, would be the following stuff: - How many MoS more than the chaser needs the chased to evade - How much MoS of advantage starts the chased with - A small list of events that will relate to the rolls between both: Botches, critical successes and sudden big differences, plus the occasional moxie point spent by the player(s) (or the NPC if it's important enough). I think that with these three simple points you can make an exciting enough chase, without using complex rules. It dumps a lot of weight on you, and luck is very important, but the way MoS is implemented in EP I think it's easy enough. Let's see an example, in a crowded market. "A" is the chaser (Freerunning 70), while "B" is the chased (Freerunning 60, plus +10 from knowledge of the habitat and +10 from teamwork: there is a small flying drone with a camera, controlled by a supporting character, keeping track of events around him): - A needs 10 MoS more than B to evade at the end of the turn - A starts with an advantage of 2 MoS (let's say, about 10 meters). Round 1: A rolls 32 (MoS 3), while B rolls 12 (MoS 1) => A's advantage is now 2+(3-1)=4 Explanation: A was able to see B before he was too close to grab him, and started running like a madman. Round 2: A rolls 66 (critical!), while B rolls 76 (MoS 7) => A's advantage is now 4+(6-7)=3, but the critical gives +3 (for example), for a total of 6 Explanation: throwing a kid in B's way, A manages to increase his advantage a little, thanks to the efforts from B to avoid hurting the child. Round 3: A rolls 45 (MoS 4), while B rolls 96 (failure). This would mean that A evades successfully (6+(4-0)=10),but B is the Player Character and decides to use a Moxie point to turn the roll into a 69. This means 6+(4-6)=4 Explanation: B was losing ground, but his helper managed to warn him about an incoming car. A had no idea of the vehicle, and while he managed to avoid it, B was able to take advantage of his foe's lose of momentum. And it could go on. As you can see, the most important part is to have some events ready to explain the rolls of the dice, and give them a good enough narrative side. By chosing only the tens of the roll as the MoS to compare we speed things, with the loss of small details, and I put the critical roll as a +3 to the MoS, but it's your choice how much it would give (the more it gives, the more important luck becomes).

"It's from the game Top Secret/S.I." Classic game, it's been a while since I played that. Thanks for the file!