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Tsumego From Games 37 / Attempts
Sub-page of TsumegoFromGames37
Ko or deadThe following diagrams show either failures by Black or plays which create a ko. However the ko is not as good as in the /Solution.
How about this?
nando: If
After
nando: thanks Arno, but I still have a doubt: what if
Arno: you are right,
Notochord: (Shouldn't ever ever have to be ko. Black has lots of eyespace and eyeshape, so it would be surpising to see him forced dead, and it is also rare to see such a relatively large eyespace made seki. I think
unkx80:
Notochord: Sorry: you are correct, I misread this variation. 'b' for
I'm very bad with calculational mistakes since I tend to operate a bit lopsidedly on the more intuitive end of things, so feel free to pipe up if I am starkly wrong.- Just connecting directly should also pretty clearly work, since its practically the same thing, and the most vital point.
unkx80: Here
Notochord: I'm not sure that
unkx80: Sorry but I can't help feeling a bit tired explaining this again and again. (But really, it's not your fault.) I shall leave it as a reading exercise this time. If you can solve Beginner Exercise 196, then you should be able to solve this as well.
Notochord: I see. Thanks.
DJ: May I have a try? What about
nando: What if
Arno: yes The long sequenceThe long sequence shows nicely that a fight can carry on into parts of the board which you have not imagined earlier. Although in the end, the "long sequence" fails (sometimes only by one liberty in a semeai).
Dave: Quite and interesting position. In such a cases, I think the first question to be answered is what if Black simply connects? This threatens to force one eye along the edge. Also, as we see above a White throw in at a is frequently a very damaging play against Black's eye space. However, it is important to realize that Black has resources here as well. An early Black play at b, threatens to force a large ko at c while preventing the throw in. I haven't found outright life for Black yet but there are some interesting variations along the way. Let's see what people can find. :-)
unkx80: This is frying my brain when I am supposed to be working on my thesis. ;) I don't gurantee the correctness yet though. ;P
Dave: What a great idea! I had only considered the case where playing 5 as soon as possible starts a large ko at 8 where Black has a huge number of internal ko threats.
Dave: So White has to give way and play
Dave: Black ends up short of liberties so...
Dave: Black first turns aside at
Dave: Here also
Arno: as I have now added the whole board you can see that
As the previuos line fails White plays
Instead of playing a immediatly, Black plays
Arno: I looked at the position some more ...
Because of the cutting point at So I think the the long sequence (in all variations) fails.
When Black plays
White is ahead after This is a copy of the living page "Tsumego From Games 37 / Attempts" at Sensei's Library. ![]() |