Endgame 3 - Accurate Local Evaluation

- Title: Endgame 3 - Accurate Local Evaluation
- Author: Robert Jasiek
- Publisher: Robert Jasiek
- Edition: 2019
- Language: English
- Price: EUR 26.50 (book), EUR 13.25 (PDF)
^{*} - Contents: endgame
- ISBN: none
- Printing: good
- Layout: good
- Editing: good
- Pages: 256
- Size: 148mm x 210mm
- Diagrams per Page on Average: 5
- Method of Teaching: principles, methods, classification, examples
- Read when EGF: 5 kyu - 9 pro
- Subjective Rank Improvement: o
- Subjective Topic Coverage: +
- Subjective Aims' Achievement: ++

The values of a local endgame depend on its type and lengths of sequences. Do we have a local gote or sente? For how long should local alternating play proceed? When must we interrupt and play elsewhere? By answering these essential questions, we can calculate the values correctly. Therefore, we avoid losing many points due to evaluation mistakes.

The book is the result of 15 months of full-time work. Half of it has been research, which has been necessary to fill huge gaps in earlier theory and create a consistent, sufficiently complete and well applicable, general theory of endgame evaluation. Previously, we were only given the chance to compete with 9 dans on the topic of getting the last point. This book enables every serious learner to reach this level on the much broader topic of local endgame evaluation. This is so because the methods and principles often represent truths derived from mathematical theorems. The value calculations in the examples are supported by meticulous proofreading.

- The chapters 'Gote, Sente and Short Sequences' and 'Gote and Sente Options' evaluate local endgames with short sequences consisting of one or two plays worth playing successively. The former studies local endgames in which a player starts a gote sequence, whose continuation results in a sente sequence. The latter studies local endgames in which one player chooses either his gote option starting a gote sequence or his sente option starting a sente sequence. Both kinds of local endgames are evaluated differently.
- The intermediate chapter 'Local Sequences and Endgames' briefly introduces privileges, ko and the global positional context, discusses double sente, introduces long sequences consisting of at least 3 plays, and provides simplifications. We learn that, usually, local double sente does not exist, its traditional evaluation has had little meaning, and how to evaluate and play a perceived double sente in the global context: we do not always need accurate evaluation as a local gote with follow-ups but can often apply principles to evaluate like a ko exchange. Long sequences are introduced by first examples, calculation of their values, classifications of the types of sequences and local endgames, and the properties of long sequences worth playing successively (called 'traversal sequences'). Simplifications are very fast tools, with which we can sometimes circumvent detailed methods.
- The next two chapters explain ordinary or fast evaluation of long sequences. Both major kinds of evaluation determine the count and move value of an initial local endgame. Ordinary evaluation also determines the gains of the sequences' plays to clarify the correct moments of interrupting local play and playing elsewhere, and assesses whether ko threats should be preserved. Fast evaluation skips such details but applies sophisticated means to only determine the initial values.

A local gote has a 'gote count' and 'gote move value' while a local sente has a 'sente count' and 'sente move value'. Calculations of gote values differs from calculations of sente values. Initially, we do not know the type of a studied local endgame yet. Therefore, we consider 'tentative' values. We can confirm them by confirming a value condition. For example, if we compare a tentative gote move value of the initial local endgame to a smaller follow-up move value, this condition of decreasing move values confirms the gote move value and type 'local gote' of the local endgame.

The book explains the similarities and differences of value conditions for local endgames with Black's follow-up, White's follow-up, both players' follow-ups or less valuable iterative follow-ups. A short section on multiples provides additional insight. Usually, values are calculated from Black's perspective (positive values favour Black). However, the reader can also study the optional sections on White's perspective, for which counts, calculations and conditions differ.

We need different conditions and verify additional assumptions for those local endgames with a player's gote or sente options. For them, the reader can choose among two kinds of equivalent value conditions.

The theory is explained in detail by introductions, value conditions stated as formulas, principles and text, summarising tables and value trees. To ease learning of the theory, the examples are very basic. For every example, the book demonstrates calculations for all possible, alternative value conditions. Some examples are close calls, for which only accurate calculations can determine the right values.

The scope of examples varies from simple to advanced - from three to nine moves worth playing successively. The meticulous calculations proceed move by move and position by position. Every type of local endgame is discussed. There are also counter-examples including a crucial one refuting wrong earlier theory.

We can sometimes apply one of the three sophisticated methods of fast evaluation: 'comparing the opponent's branches', 'comparing counts' and 'comparing move values'. If certain assumptions are fulfilled, we can greatly accelerate calculation of initial values. Examples demonstrate how very much analysis can sometimes be accelerated. Diagram trees assist our perception. Font aspects enrich the presented information.

Although research developing, and completing invention of, the theory has been much more demanding than anything I have studied before, the now available theory is well applicable. We must learn some value conditions and spend the necessary effort on doing the calculations while not accidentally confusing values. Tactical reading can be more difficult as soon as we become as familiar with endgame calculations as we are with tactical reading. Both are essential. A major part of our effort lies in recalling several intermediate values, which we need until determining the desired initial values. Hence, the reader's major effort is two-fold: he must become familiar with the notation of values and calculations in the book; he must practise calculations until they become his second nature, quite like tactical reading.

Why do we invest in such effort? We can greatly simplify our tactical reading and enable decisions when it would be too complex. We must not neglect any central topic of go theory, such as endgame evaluation. Our weakest skills impede our strength. If we are weak at endgame evaluation, we must study it.

* = These are the endconsumer prices in EUR according to UStG
§19 (small business exempted from VAT).

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2020 Robert Jasiek