There are answers to these in the FAQ:-
Quote:
Q: When shooting at a formation where some units are in cover and others are not you can elect whether to shoot at targets in cover (in which case you take the -1 penalty) or not (in which case you don't). What is the scope of this decision?
- The entire shooting formation?
- Each shooting weapon type?
- Each shooting unit?
- By damage type (AT vs. AP)?
- Each shooting weapon?
- Unspecified, work it out with your opponent?
For example, if someone shoots at my tactical formation, which has three exposed rhinos and six marines in cover, does the attacker have to take the -1 to hit the rhinos (which is AT fire), if he wants the tactical marines to be potential targets for his AP fire??
A: The choice to shoot at in-cover or out-of-cover targets must be done by the entire formation. It can only be separated by type of weapon fire.
And regarding whether a unit is "in cover" or not:-
Quote:
Q: When is a unit in cover? A fraction of the model, more than half, fully?
A: For infantry, they can gain cover from simply touching an AV, so it makes sense that would be the standard for claiming other cover. As long as they touch the terrain, they can claim the benefits.
For vehicles, impassable terrain works based on the "hull down" rules and whether the terrain obscures the model. For dangerous terrain there is a relatively easily determined standard based on the dangerous terrain check. If the model at least touches the terrain and is willing to take a dangerous terrain check, it can claim the cover benefits, i.e. no cover benefits without taking the terrain penalty. For terrain that has no effect on vehicles but might provide cover, it is best to remain consistent with infantry and dangerous terrain for vehicles and simply declare that a vehicle touching the cover can claim the benefit.
As always, though, terrain should be part of the 5 minute warmup. Players will have to work out, for example, whether touching the base of a piece of terrain counts as touching it, or if the model would need to butt up against the actual terrain feature itself rather than just the base. The answer might even be different from terrain piece to terrain piece. For example, the entire base of trees may count as being in the trees, but the base surrounding a building does not.
As always, it is best to agree in the 5 min warm up.