BQM 262
From Cho Hun-hyeon Weiqi Sucheng. Either the book is wrong or I am seriously misunderstanding an aspect of this problem. Please review and correct.
Volume 3, Problem 23
After
, the marked white group (
) wins the capturing race with the marked black group (
), thereby saving the
stones. Black does have a ladder against the two
stones. Are ladders assumed to be good for Black in problems of this type?
Bill: Yes, as I understand it. That follows from the assumption that all relevant stones are shown. If there is a ladder breaker, it should be shown. If one isn't shown, it's not there.
unkx80: Yes. Unless stated otherwise, Chinese books assume that the remainder of the board is empty, and hence all ladders are good for either player. I presume Japanese books make the same assumption as well. In fact, the Igo Hatsuyoron seems to take this idea a bit far, in that quite often crawling along the second line is also considered a solution for making life.
Thank you both. Yes, all the stones are shown. The book diagram only a quarter of the board.
unkx80: I wanted to post something about this too. However, I was not able to read out completely what happens here.
at
may be another possible variation.
![[Diagram]](../../diagrams/35/f8041c42887ba52b53d86eb79096e209.png)
![[Diagram]](../../diagrams/2/800027ab47d2ce1491eef192f854b1c8.png)
![[Diagram]](../../diagrams/46/a5824ad384c9d24bfb8dbf232c3eb1b1.png)
![[Diagram]](../../diagrams/51/91c5354f2f31b8c96b65b5713b9fb83f.png)
do everything we want without requiring a ladder?
![[Diagram]](../../diagrams/32/c45f9884becace3014b1f8653364f3e7.png)
2024 the Authors,
published under the ![Sensei's Library [Welcome to Sensei's Library!]](../../images/stone-hello.png)