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Basic Ko Anomalies
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.
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. ![]() |