Jerry throws a grenade at Bob. He rolls mobility and has 2 successes, landing the grenade in the same hex as Bob [but the extra success adds nothing]. An explosion roll of 2d8 is rolled, resulting in two more successes. Hit location is rolled, and Bob is hit in the arms for 3 damage [2 damage from the explosion, +1 for the extra success].
Sorry, I don't get how damage now works. There is no base damage, so, why is there 2 damage from the explosion and +1 extra for success, if the roll generates two more successes?
Could you walk me through, please?
There is no base damage for a fragmentation hand grenade, no so this means that you can only use them to target a hex, not a specific individual. This is also the reason why extra successes doesn't have any effect, either you hit the hex or you miss it. But everyone in the hex will suffer from the explosion. A fragmentation hand grenade have a blast ration of C so it does explosion damage according to C. This means that everyone in the hex must roll 2d8 to see if they are damaged by the grenade. This explosion have a base damage of a 2 so one success on those 2d8s will result in 2 damage, an extra success on the 2d8s will result in +1 damage for a total of 3. 2d8 can only result in two successes so the maximum damage for this is 3 (2+1).
If we instead take the antitank hand grenade, extra successes on the skill roll will have an effect since that grenad has a damage (and crit) ration. If you got two successes with your throwing skill roll (Mobility I think), it will do 6+1 damage for a total of 7 to the vehicle (or person if you aimed on an individual). After this is done, the antitank hand grenade will cause a D explosion, which means that everyone in the vehicle (if you penetrated the vehicle) or everyone in the hex if it explodes somewhere in hex have to roll 2d6 (D blast) to see if they take explosion damage.