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Referenced by
Notchers
TwoSpaceNotchers
ThreeSpaceNotchers

 

One Space Notchers
   

OneSpaceNotchers - (c) James Davies - are groups that consist of a chain on the second line, interrupted by a notch of one empty space on the second line and one stone on the third. See also notchers, TwoSpaceNotchers and ThreeSpaceNotchers.


[Diagram]
Diag.: One space notchers

Marked points: possible weaknesses
Marked stones: legs


Classification

See notchers for the coding.

  • All of 111xx, 112xx are dead and not worth discussing
  • All of 1xxWW are dead until 133WW. 133WW can make a ko. From 134WW onward it can live by connecting the stone in atari:

[Diagram]
Diag.: 134WW

Black lives with 1


122


[Diagram]
Diag.: 122WN

dead


[Diagram]
Diag.: 122WS

can live with 1


[Diagram]
Diag.: 122NN

can live with 1


[Diagram]
Diag.: 122NS

can live with 1


[Diagram]
Diag.: 122SS

can live with 1


All 122 can live, expect 122WW and 122WN which are dead

123


[Diagram]
Diag.: 123WN

Black can make a ko



[Diagram]
Diag.: 123NW

Black can make a ko


[Diagram]
Diag.: 123WS

Black can live


[Diagram]
Diag.: 123NN

Black can live


(...)


[Diagram]
Diag.: 123SS

Black can live. White can kill at 1.


All 123 can live, except for 123WW, dead, and, 123WN and 123NW, where Black can make a ko.


133


[Diagram]
Diag.: 133WN

Black can live at 1 or A.


[Diagram]
Diag.: 133WS

Black lives. White 1 is the strongest move. Any other move is answered by Black 1.


[Diagram]
Diag.: 1 133NN

Black lives. White 1 is the strongest move. Any other move is answered by Black 1.


(...)

133WW makes ko. 133WN can make life. All other 133xx live


Table

See notchers for the coding.

 111WW D - 112WW D - 113WW D -- 114WW D -- 115WW D -- 116WW LD
111WN D - 112WN D - 113WN D -- 114WN D -- 115WN LD - 116WD LK
111WS D - 112WS D - 113WS LD - 114WS LD - 115WS LK - 116WS LK
111NN D - 112NW D - 113NW D -- 114NW D -- 115NW LD - 116NW LD
111NS D - 112NN D - 113NN LD - 114NN LD - 115NN L -- 116NN L
111SS D - 112NS D - 113NS LD - 114NS LD - 115NS L -- 116NS L
xxxxx --- 112SW D - 113SW LD - 114SW LD - 115SW LD - 116SW LD
xxxxx --- 112SN D - 113SN LD - 114SN LD - 115SN L -- 116SN L
xxxxx --- 112SS D - 113SS LD - 114SS LD - 115SS L -- 116SS L
 122WW D -- 123WW D -- 124WW D -- 125WW LD   
122WN D -- 123WN KD - 124WN LD - 125WN ?
122WS LD - 123WS LD - 124WS L -- 125WS ?
122NN LD - 123NW KD - 124NW LD - 125NW ?
122NS LD - 123NN LD - 124NN L -- 125NN ?
122SS LD - 123NS LD - 124NS L -- 125NS ?
xxxxxx --- 123SW LD - 124SW L -- 125SW ?
xxxxxx --- 123SN LD - 124SN L -- 125SN ?
xxxxxx --- 123SS LD - 124SS L -- 125SS ?
 133WW KD - 134WW LD
133WN LD - 134WN ?
133WS L -- 134WS ?
133NN L -- 134NW ?
133NS L -- 134NN ?
133SS L -- 134NS ?
xxxxxx --- 134SW ?
xxxxxx --- 134SN ?
xxxxxx --- 134SS ?

(Work in progress)

Authors: BillSpight, DieterVerhofstadt



This is a copy of the living page "One Space Notchers" at Sensei's Library.
(C) the Authors, published under the OpenContent License V1.0.