Attacks per round pre-mastery patch and after mastery patch.
Looking at the Specialization chart on page 101, one might get the idea
that the proficiency system was completely nerfed from BG. Well it was
only partly nerfed. Here is the accurate chart:
points spent to hit bonus damage bonus attacks
1 (Proficient) 0 0 1
2 (Specialized) +1 +2 3/2
3 (Master) +2 +2 3/2
4 (High Master)* +2 +3 3/2
5 (Grand Master) +2 +4 3/2
* Improves weapon speed.
This gives you an extra +1 damage at High Master. Although if you
installed TeamBG's weapon specialization "fix" it will restore this chart
to what it was in BG:
points spent to hit bonus damage bonus attacks
1 (Proficient) 0 0 1
2 (Specialized) +1 +2 3/2
3 (Master) +3 +3 3/2
4 (High Master) +3 +4 3/2
5 (Grand Master) +3 +5 2
I hope it helps.
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It's bleedin dark down here, slippery too.

Man, that's a pisser.