Quotation reference:
viewtopic.php?p=143052#p143052



"Counting" is the trivial part "territorial positional judgement". Distinguishing territory intersections from non-territory intersections etc. can take minutes, but, with practice, afterwards counting the former takes only seconds. For now, I presume that you do not ask for endgame value assessment.

It depends a bit on what you want to consider "good". Let me first list available books (mainly or exclusively) on the topic of territorial positional judgement:

- Positional Judgment / High Speed Game Analysis - Cho Chikun - http://senseis.xmp.net/?PositionalJudgm ... meAnalysis
- Positional Judgement 1 / Territory - Robert Jasiek - http://home.snafu.de/jasiek/PositionalJudgement.html
- The Theory and Practice of Analysis - Valery Shikshin - http://senseis.xmp.net/?TheTheoryAndPracticeOfAnalysis
- Yi Ch'ang-ho on Evaluating Positions viewtopic.php?f=57&t=8625 and viewtopic.php?f=17&t=8627
- other, often trivial Asian counting problem books

Too little theory drops out the latter. Too many factual mistakes drop out The Theory and Practice of Analysis. This leaves us with

- Positional Judgment / High Speed Game Analysis - Cho Chikun
- Positional Judgement 1 / Territory - Robert Jasiek
- Yi Ch'ang-ho on Evaluating Positions

All of them are worth reading, but, if you read the second, you do not need to read the first, which teaches only a fraction of the relevant theory.

Language might be a problem for the third one, but if you are not scared about reading diagrams and value calculations only, then, especially with Fairbairn's review, you can read it nevertheless. If you really can buy only one of the books and let your decision depend on amount of theory per price, then the last two books are good candidates. One of the links above refers to my opinion on a comparison. There are, of course, other possible decision criteria. E.g., you can let your decision depend on how you want to assess territory:

Jasiek: the territory is calculated also for insecure moyos.
Yi Ch'ang-ho: a placeholding parameter is considered sufficient for insecure moyos.

Either approach has its advantages and disadvantages. Or you can ask yourself whom you believe more:

Jasiek: the 3-3 stone is worth 8 points.
Yi Ch'ang-ho: the 3-3 stone is worth 4 points.

What about The Endgame? http://senseis.xmp.net/?TheEndgameTheBook

Of course, discussion can be extended to endgame books (I do not mind at all), but I have understood the quoted poster to seek positional judgement books. Well, let him clarify:)