Forum for J+1 group

((no subject)) [#3404]

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ThorAvaTahr: ((no subject)) (2017-01-30 21:59) [#10889]
[Diagram]
corner  

Status after B1?

I believe B1 is often sente.

X
HermanHiddema: Re: ((no subject)) (2017-02-01 10:30) [#10891]

I may have missed something, but right now I can't find anything better than seki for black if white plays elsewhere.

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212.189.110.21: Sente? (2017-02-28 17:13) [#10916]

I'll give it a try: ko?

[Diagram]
Moves 1 to 10  

Requires using shortage of liberties

X
174.104.194.232: Re: Sente? (2017-03-01 05:19) [#10917]
[Diagram]
 
ThorAvaTahr: Re: Sente? (2017-03-01 10:03) [#10918]

off course W3 is the natural shape, but here it doesn't seem to work. That's why i tried W5 first.

[Diagram]
corner  

(black a for white b can be omitted)


W5 is actually a little tricky as black may be tempted to play W3 in the above diagram himself, but that seems wrong:

[Diagram]
corner  

B10 on W7. Although this can be reduced to a bent 4 in the corner, white has the necessary liberties to make it alive.

HermanHiddema: Re: Sente? (2017-03-01 14:14) [#10919]
[Diagram]
good empty triangle?  

Does black have anything after W3?

Unkx80: Re: Sente? (2017-03-01 20:27) [#10920]
[Diagram]
Approach ko?  
[Diagram]
Approach ko?  
ThorAvaTahr: Re: Sente? (2017-03-02 10:26) [#10921]

Hmm, ok, I can't see anything but approach ko now. So black+circle not sente until the (late) endgame.

ThorAvaTahr: Re: Sente? (2017-03-02 10:18) [#10922]

deleted?

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ThorAvaTahr: ((no subject)) (2017-03-02 10:16) [#10923]
[Diagram]
1000 year ko? so nothing?  
[Diagram]
same as unkx  
X
HermanHiddema: Re: ((no subject)) (2017-03-02 10:46) [#10924]
[Diagram]
You can avoid the 1000 year ko with seki  
 
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