Here is a whole web page about ratings:
http://billiards.colostate.edu/threads/ratings.html
A-B-C-D mean different things to different people. APA 2-7 (or 9) means different things in different areas. A single race to 11 tells you only a little about how you rate against your opponent.
For the APA 4s around here, break-and-runs are very rare, but you don't say what system you are talking about when you say "4".
So, until you have played for six months or so in a system, it's really hard to say how you rank within that system, especially if your game is changing rapidly.
from the link provided above
i think this is a great rating scale
from phil capelle
Here's an alternative and more-detailed interpretation of the A-D scale from Capelle's "Play Your Best Pool" (p.386):
D: A beginner or someone who plays so infrequently that their game remains in the beginner category.
C-: A below average player - this denotes a player with some recognizable skills who has definitely risen from the ranks of beginners. This is the first major milestone.
C: An average player - describes a large section of pool enthusiasts with experience whose games perhaps have leveled off, or that only play occasionally.
C+: Above average player - this group plays a very acceptable game of pool. They tend to dominate their level of competition.
B-: This is perhaps the biggest hurdle, as a good number of players peak at the C+ level. A B- is a good player who is quite capable of running a rack of Eight Ball or Nine Ball. However, they usually lack consistency.
B: A solid, advanced player - these players can run out fairly regularly, but lack a little consistency.
B+: Players at this level are often mistaken for lower level A players when they are playing well because they play a very tough, well-rounded game. They can run out from nearly anywhere at anytime.
A-: Another big jump is required to break through to the "A" level. This group of players could be classified as semi-pros or top amateurs. They are very skilled in nearly all facets of the game. They run out easily and very often.
A: A professional quality player who can compete with and occasionally beat all but the best players. Very skilled, solid, and consistent. Runs multiple racks quite often. Tough to beat.
A+: Touring Pro - the best. Skilled in every area of the game. Breaks and runs out multiple racks regularly. Definitely in a class by themselves.
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