[blml] abbreviations [SEC=UNOFFICIAL]

[Nigel]

NB = "Nota Bene" (note well) or less likely: New Brunswick or Niobium
NP = (usually) "No Problem"  but  (when computing) "Non deterministic 
Polynomial"
 
I admit that I wrote "it is np hard to make the rules simple, clear, 
objective and consistent enough for players to understand"
I confess that this was intended as a (pathetic) pun -- because NP hard 
problems are the opposite of "no problem":
they are particularly intractable.  Sorry.