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SuperkoAnomalies

 

Basic Ko Anomalies
   

RobertJasiek:

The basic-ko rule leads to anomalies.

The most important anomaly is the possibility of long cycles.

Another anomaly lets ko positions of the type Pendulum Ko, which feel like a fighting ko if only one of them is on the board, be anti-sekis. Anti-sekis were supposed not to exist until I discovered them in the position below, where successive passes provide the shortest perfect play under most rulesets.

[Diagram]
stable anti-sekis


If you question superko for its anomalies, you should do the same for the basic-ko rule or every other ko ruleset.


I think a more important anomaly of basic ko is the possibility of MoonshineLife, which is ruled out only by special means in most rulesets.



This is a copy of the living page "Basic Ko Anomalies" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.