Hi @questioneer,
As far as we know, the BBR is also based on a set of House Rules - and as far as we know they are not official OOB Axis & Allies or official Expansion rules.
All Axis & Allies rules other than those by Larry Harris are based on House Rules or similar sets of rules.
We are working on the Axis & Allies Global 1940 House Rules Expansion to be announced as the Official Standard Axis & Allies Global 1940 Expansion rules - since these rules are the Most Advanced Expansion rules in the entire Axis & Allies Universe.
Naturally, the Axis & Allies Global 1940 House Rules Expansion is advanced in a way that takes Axis & Allies to a new level of Strategic Wargaming.
We’ve been playing the BBR during 9 of our tournaments - and I can say, that the BBR is very well developed and it is also interesting as variant to the OOB G40.
But the BBR is in no way comparable to the Axis & Allies Global 1940 Expansion in terms of Tactical and Strategic Warfare - not to mention the unlimited options that are now made available in the Axis & Allies Global 1940 House Rules Expansion to the players during the game.
Some of the most advanced rules that distinguishes the Axis & Allies Global 1940 House Rules Expansion from BBR and all other G40 variants are:
Paratrooper units
Waffen-SS units and Waffen-SS Armies
Panzer Army Formations
Soviet Army Corps Formations
Army Groups (multiple Armies combined into Army Groups)
Winning Conditions
Those are only a few of the advanced rules that bring not only the Tactics & Strategy to a higher level - they also bring a tremendously well planned Historical Dimension to the game that takes all players back to World War II itself.
We wish you luck & fun all the way.
Captain