Here is another card I am having difficulty with in a solitaire game (US v 'the bots')
The game situation:
There is a MOMENTUM event preventing AMBUSH
NVA are first up and (because they cannot use the ambush shaded event) take Ops+Special ability (and I use the bot instructions. So far so good...
No. The Momentum you mention does NOT prevent the NVA play of shaded "Main Force Bns", for two reasons:
* As Russ mentions this is a Capability (5.3; for bots see also 8.1 bullet 4). The shaded version doesn't grant any Ambushes now (so there is nothing for the Momentum to stop); instead it changes how VC Ambushes work for the rest of the entire game (i.e., it extends well after the Momentum ends on the next Coup).
* Even if the Event had granted a free Ambush now, the Momentum wouldn't have been able to stop it, because per rule 5.1.2 the currently played Event overrides any previous ones when the Event texts contradict one another.