Life in 19x19. Go, Weiqi, Baduk... Thats the life.
https://lifein19x19.com/
After further analysis I think white can save one of her two groups but not both, but OC I am not completly sure.Gérard TAILLE wrote:https://senseis.xmp.net/?ShikatsuMyokiTsumegoSeries76
I understand White can live without any condition but I do not find how white can live if Black can avoid losing the ko fight at "a".
Can anybody help me?
The problem with the solution is that black has not fighted the ko. AssumeKirby wrote:The solution given on senseis seems fine, does it not?
used a ko threat, 
answer the ko threat and 
retake the ko. That way black has gained locally one move which is quite different.Looking at the first page of Shikatsu Myoki Tsumego Series https://senseis.xmp.net/?ShikatsuMyokiTsumegoSeries I see killing, living and Ko problems.Cassandra wrote:One major assumption for local tsume-go is that the rest of the board is empty / that there are no worthwile moves outside the local area shown.
"Double-ko" is considered "unconditionally alive".Gérard TAILLE wrote:Here it is a living problem and I underderstood living here means living without conditions but may be I am wrong.
You do not get my point Cassandra. With black I only want to fight the ko at "a", not the others:Gérard TAILLE wrote:https://senseis.xmp.net/?ShikatsuMyokiTsumegoSeries76
I understand White can live without any condition but I do not find how white can live if Black can avoid losing the ko fight at "a".
Can anybody help me?
ko theat answer to ko threatDear Gérard,Gérard TAILLE wrote:You do not get my point Cassandra. With black I only want to fight the ko at "a", not the others:
passCassandra, I confess I have difficulty to understand what is your view, sorry for that.Cassandra wrote:Dear Gérard,Gérard TAILLE wrote:You do not get my point Cassandra. With black I only want to fight the ko at "a", not the others:
I am very well aware of what you wanted to do. But if you are talking about Shikatsu Myoki #76, ...
... your desire will end locally as in the diagramme above.
However, if you wanted to study an extended VARIATION of that position (NOT the original TSUME-GO), you should add some kind of precondition that creates a firm connection to other positions on the Go board, and also specifies which value potential external ko threats of both sides have.
creates a SECOND ko shape.
captures the ko at right. connects, as he does not have any LOCAL ko threat. recaptures the ko at right.
captures the ko at left.
creates a ko shape.
captures the ko.
plays a LOCAL ko threat.
answers.
recaptures the ko.I agree till that point. But here, with black to play, I stop playing locally and say:Cassandra wrote:"UNconditional" does not imply that there is no ko involved!
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Shikatsu Myoki #76:
creates a SECOND ko shape.
Yes jlt but, in addition, if Black has enough ko threats elsewhere then the sequence given is not the best one for white. By choosing other moves I think white can save one of her groups.jlt wrote:To summarize, if I followed correctly your conversation,
1) If there are no ko threats elsewhere, White lives by double ko.
2) If Black has enough ko threats elsewhere, then Black can kill White.
Cassandra calls the conjunction of 1) and 2) "living without condition", while Gérard calls that "living by ko"?
NO. Not if we talk about TSUME-GO.Gérard TAILLE wrote:Black does not have any LOCAL ko threat => White lives in ko. => White is NOT unconditionally living.
Don't you agree with that?