We have found that it is important to determine — and announce — and reach agreement upon — which army lists you will be using. The MRB or an army book. Before a game begins.
It is disconcerting to discover, mid-game, you are using the MRB and learn that your opponent is operating, in effect, with a different definition of what a unit and its capabilities might be. It is reasonable to understand that a player might not have all of the army books … and, by default, is using the MRB. Courtesy would indicate that the MRB provides the default list.
We have had to deal with a player who routinely found various advantages in the army books which he sprang upon unknowing opponents who were using the MRB. Which led to heated arguments and long term anger and eventually, to the departure of said player.
But it is fun to apply an army book to a scenario. It livens up planning for the game an introduces new wrinkles in the actual play.
.
