Ikedas Rule/example 1

Sub-page of IkedasRule
[Diagram]

Diagram 3-7.1

"..The problem arises in positions like Dia. 3-7. Only neutral points are left, the number of neutral points is even, the black group at the bottom has lost its outside liberties, and the safety of this group is uncertain. Suppose it is Black's turn. Even if Black plays 'a' to remove the danger, he can still get one of the two neutral points. Under area rules, that is, he can make a free reinforcing move at 'a.' He does not need to verify whether it is actually necessary..." --[ext] Section 3.5 "The disadvantage of Area Rules", [ext] On the Rules of Go, Ikeda Toshio


[Diagram]

Diagram 3-7.2

After (1) White assumes black is skilled enough to avert the invasion and occupies the last dame.

 Territory+Prisoners Score
 W30 B31
 Area Score
 W60 B61
 Ikeda's Rule
 Black passes first
 W60 B61
 Button Go
 Black passes first +0.5 Black
 W60 B61.5

[Diagram]

Diagram 3-7.3

Black unnecessarily reinforces its territory.

 Territory+Prisoners Score
 W30 B30
 Area Score
 W60 B61
 Ikeda's Rule
 White passes first +1 white
 W61 B61
 Button Go
 White passes first +0.5 white
 W60.5 B61

[Diagram]

Diagram 3-7.4.1

White's isn't too bright and thinks it can win the semeai.

[Diagram]

Diagram 3-7.4.2

Obviously it loses, yet by keeping sente it prevents black from grabbing the last dame.

 Territory+Prisoners Score
 W35 B36
 Area Score
 W60 B61
 Ikeda's Rule
 Black passes first
 W60 B61
 Button Go
 Black passes first +0.5 Black
 W60 B61.5

[Diagram]

Diagram 3-7.5

White's IQ is getting worse, this time it not only invades but also loses sente by performing Baka no Itte. It is punished by losing both dame.

 Territory+Prisoners Score
 W30 B32
 Area Score
 W59 B62
 Ikeda's Rule
 White passes first +1 white
 W60 B62
 Button Go
 White passes first +0.5 white
 W59.5 B62

/discussion


This is a copy of the living page "Ikedas Rule/example 1" at Sensei's Library.
(OC) 2007 the Authors, published under the OpenContent License V1.0.
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