[Welcome to Sensei's Library!]

StartingPoints
ReferenceSection
About


Aliases (info)
DeiriValue
Swing
SwingValue

Referenced by
Tenuki
BasicEndgameTheory
MiaiCounting
DiscussionOfTheVa...
WhatWasTheHighest...
EquivalentGameToGo
GTLReview1558
GunSix
EndgameHowToFindT...
Oyose

 

Deiri Counting
   

The value of a play indicates its urgency. Normally you should play the largest play, but there are exceptions. (See tedomari.)

The two main styles of evaluating plays are deiri (DEH-EAR'-EE) counting and miai (ME-EYE') counting. Miai values directly indicate the urgency of plays, while deiri values do so indirectly.

Let me start with a couple of examples.

[Diagram]
Diag.: Gote.

If Black plays first she scores 4 points, represented as a positive integer, +4.

If White plays first he scores 2 points, represented as a negative integer, -2.

The deiri value is the difference between these two results (the swing), or 6 points.

We might call the deiri value of a play its swing value.


[Diagram]
Diag.: Sente.

After W 1 the score is -5.

After B 1 White must play W 2 to live, and the net score is + 2.

The deiri value is the difference between these two results, or 7 points.

We may define deiri values as the difference between the count of the first stable position after Black plays first (called a Black follower) and that of the first stable White follower, assuming normally correct play.

A stable follower is one with a lower urgency than the original position. There is a potential circularity here, but a line of play eventually ends, as here, in a scorable position, or in a repetition, which is prohibited by the rules. (If it is not, the original position does not really have a value.)

--BillSpight



This is a copy of the living page "Deiri Counting" at Sensei's Library.
(C) the Authors, published under the OpenContent License V1.0.