1998-12-01 last update, 1996-07-07 first day, Robert Jasiek
Copyright: All rights of the author are preserved according to the international law.

Examples 1

Introduction

This page intends to ease understanding of The New Ko Rules. For further important, difficult or extraordinary examples see Examples 2. Conventions are defined.


Examples

Definitions for Ko

ko mouths, ko couplings, and ko positions

Definitions of Ko Types

There are FKs and DKs. A DK may be a DLife or a DDeath. A DLife may have a ko coupling or not. If a DLife has a ko coupling, then it may be in one of two states: stable DLife or instable DLife.

DLifes with a ko coupling

If a DLife has no ko coupling, then it is a single DLife. The name reflects its number of ko mouths: one.

single DLifes

A DDeath may have a ko coupling or not. If a DDeath has a ko coupling, then it may be in one of two states: stable DDeath or instable DDeath. In such a DDeath all cyclical MSs, during which all ko strings of the ko position are captured, violate the basic ko rule.

DDeaths with a ko coupling

If a DDeath has no ko coupling, then it is a single DDeath. The name reflects its number of ko mouths: one.

single DDeaths

A ko position, that is not a DK, is a FK. In general the nature of FKs can be described as so called unsettled life and death of involved ko strings.

FKs

Rules

basic ko rule (1)

basic ko rule (2)

fighting rule (1) - at b shall be a B stone, at d shall be a W stone.

fighting rule (2)

disturber rule (1)

disturber rule (2)

prohibition rule (1)

prohibition rule (2)


Links