Buitenland/ Extensions

Sub-page of Buitenland

Extensions

Quick reference to extensions on the third line from a single stone

Local context versus whole board situation

Invading extensions

  • No surrounding enemy stones
[Diagram]

Two Space Extension

A Two Space Extension on the third line is an ideal extension because it cannot be cut and forms a base.

[Diagram]

Two Space Extension

Cannot be cut: B1 tries to cut, W2 blocks.

[Diagram]

Two Space Extension

Forms a base
DefendingABaseOnTheSide
BasicLiveShapes
SmallestGroupWithTwoEyes#toc3
BasicLivingEyeShapes
FourDieButSixLive on the third line
Six Die But Eight Live on the second line


[Diagram]

Three Space Extension

A Three Space Extension on the third line forms a base is faster but has a defect at a.
InvasionOfThirdLineThreeSpaceExtension


  • Within the context of strong surrounding enemy positions(1)

((1)a 4473 enclosure on the left and 34PointLowApproachKeima)

A Two Space Extension on the third line is considered the ideal extension.
A Three Space Extension on the third line is faster but has a defect.
A Four Space Extension on the third line is too large and can be invaded.
A Five Space Extension obviously, can be invaded too.

[Diagram]

Two Space Extension

Maybe the marked stone is not needed for these examples.


[Diagram]

Three Space Extension

This diagram comes from Graded Go Problems For Beginners Volume II


[Diagram]

Four Space Extension


[Diagram]

Five Space Extension


This is a copy of the living page "Buitenland/ Extensions" at Sensei's Library.
(OC) 2011 the Authors, published under the OpenContent License V1.0.
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