Ko Types

Table of contents Ko Types by Ko Intersections Ko Types by Positional Context Ko Types by Nature of Ko Fight Ko Types by Life and Death Top level classification Fighting Kos Disturbing kos Disturbing death Disturbing life Semi-stable kos Additional Aspect of Location Ko Types by Cycle Ko Types by Value Ko Types by Shape Links

Kos can be classified by different criteria and behaviours. Among them are

• ko intersections
• positional context
• nature of ko fight
• life and death
• cycles
• values
• shapes

Ko Types by Ko Intersections

Kos can be classified by their intersections.

For the theory, see the paper Ko

Ko Types by Positional Context

• Hanami-ko
• Game-deciding Ko
• Placid
• ActivePosition
• Hyperactive
• light ko and heavy ko

Ko Types by Nature of Ko Fight

• Hon-Ko — a.k.a. Direct ko
• Two stage ko, also see Two stage one move approach ko
• Three stage ko
• Approach ko
• Rogue ko — a ko which can be fought in various ways
• Ten thousand year ko — a ko which neither side wants to start, which may become seki instead

Ko Types by Life and Death

For the theory, see the paper Types of Basic Ko.

Top level classification

So far this classifies on the basic kos.

• fighting kos
• disturbing kos
• Semi-stable kos
• default unknown kos

Fighting Kos

The following list shows just some examples. This should be extended.

• basic endgame ko
• basic fighting ko

Disturbing kos

Disturbing death

• Dead ko
• double disturbing death
• closed death

Disturbing life

• active disturbing life
• inactive disturbing life
• 1-eye-flaw

Semi-stable kos

• molasses open kill
• molasses closed kill
• molasses life
• unknown semi-stable ko

Additional Aspect of Location

• External Ko
• Internal Ko

Ko Types by Cycle

One possible cycle criterion is cycle length:

• 2 moves (basic ko)
• 3 moves (sending-2-returning-1)
• long cycles

Ko Types by Value

• Half-point ko (minimal ko)
• Real half point ko

Ko Types by Shape

• Double Ko, among them: Double-ko seki
• Triple Ko
• Quadruple Ko
• Multiple Ko
• Moonshine Life
• Molasses ko
• Eternal life and Eternal ko
• Round Robin Ko
• Sending two, returning one
• Pinwheel ko
• Shimada's ko

Links

• Mathematical Ko Terms
• Research on Ko

Page creation by RobertJasiek.