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Referenced by
Notchers
FlyingSaucerShape
OneSpaceNotchers
ThreeSpaceNotchers

 

Two-Space Notchers
    Keywords: Life & Death

Two-space notchers are groups that consist of a chain on the second line, interrupted by a notch of two empty spaces on the second line and two stones on the third. The term was invented by James Davies. See also Notchers, One-Space Notchers and Three-Space Notchers.

[Diagram]
Diag.: Two-space notchers

Marked spots: possible weaknesses
Marked stones: legs



Classification...

211

[Diagram]
Diag.: 211WW

[Diagram]
Diag.: 211WN

[Diagram]
Diag.: 211WS

[Diagram]
Diag.: 211NN

[Diagram]
Diag.: 211NS

[Diagram]
Diag.: 211SS


All of the 211xx are dead


212

[Diagram]
Diag.: 212WW

[Diagram]
Diag.: 212WN

[Diagram]
Diag.: 212WS

[Diagram]
Diag.: 212NW

[Diagram]
Diag.: 212NN

[Diagram]
Diag.: 212NS

[Diagram]
Diag.: 212SW

[Diagram]
Diag.: 212SN

[Diagram]
Diag.: 212SS


All of the 212 are dead


222

[Diagram]
Diag.: 222WW

aka the flying saucer shape. It is dead


[Diagram]
Diag.: 222WN

Black can live


[Diagram]
Diag.: 222WS

Black can live


[Diagram]
Diag.: 222NN

Black can live


[Diagram]
Diag.: 222NS

Black can live


[Diagram]
Diag.: 222SS

Black can live



All 222 are "Black can live, White can kill" except 222WW, which is dead.


213

[Diagram]
Diag.: 213WW

dead


[Diagram]
Diag.: 213WW

Black can live

(...)



All of 213 can make life, except for 213WW which is dead


223

[Diagram]
Diag.: 223WW

Black can live


[Diagram]
Diag.: 223WN

Black is alive

(...)



All 223WW are alive, except for 223WW, where Black can live and White can kill.


233

[Diagram]
Diag.: 233WW

Black is alive

(...)



All 233xx are alive


Table

See notchers for conventions.

 211WW D - 212WW D - 213WW D -- 214WW ? -- 215WW ? 
211WN D - 212WN D - 213WN LD - 214WN ? -- 215WN ??
211WS D - 212WS D - 213WS LD - 214WS ?? - 215WS ??
211NN D - 212NW D - 213NW LD - 214NW ? -- 215NW ??
211NS D - 212NN D - 213NN LD - 214NN ?? - 215NN ?
211SS D - 212NS D - 213NS LD - 214NS ?? - 215NS ?
xxxxx --- 212SW D - 213SW LD - 214SW ?? - 215SW ??
xxxxx --- 212SN D - 213SN LD - 214SN ?? - 215SN ?
xxxxx --- 212SS D - 213SS LD - 214SS ?? - 215SS ?
 222WW D -- 223WW LD 
222WN LD - 223WN L
222WS LD - 223WS L
222NN LD - 223NW L
222NS LD - 223NN L
222SS LD - 223NS L
xxxxx --- 223SW L
xxxxx --- 223SN L
xxxxx --- 223SS L


This is a copy of the living page "Two-Space Notchers" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.