I am not sure... In 6 years i look at what i know and what i can know and still say "damn i need to hit the books"... I dont know what differnt grains do, i dont have an AG setup beyond a rolling pin and a crap load of luck... I know other people who have been brewing longer who know more and other who know less. I know people with all the equipment, and those who have none... Those with a entire libary of brewing books and those who have none.
So what tis a master brewer... well i would say a master brew is a person who no matter what is given to them to make a batch of brew; weather it be Cider, Apfelwin, An ale, A lager, Meade, or Wine... A master brewer as long as they are given enough ingredants and equipment of decent quality i would say should be able to produce somthing that no one else without his experience and knowlege could produce... With a quality and taste to match any taster or group of tasters... And do this at a momments notice (with allowed time for fermenation etc afterward)...
The above stated would not only required extensive knowlege in the chemical aspect of brewing, but also an indepth knowlege of ingredants, basic equipment, techniques basic and advanced, and also a good judge of the people he would be expected to produce an end product for... So basically we are looking at an: organic chem PHD, Mechcanical engineer, Food critic, product critic, lisenced cunsumer profiler, certified psychologist, and one hell of a lucky person... all rolled into one... or sombody with the balls to just try...
Now a Mistress brewer... i would like to meet one of those, preferablly she would be single, about 5'3", red haired, a good bust, green eyes, smooth long legs, and a preferance for the washed up young huanted type who think that the world is going to hell and nobody seems to be doing anything about it so why not work on the problem in there spare time... is there such a women?
Cheers