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Bob's problem solution
Keywords: Problem
Solution to Problem on BobMcGuigan Black to play, White dies.
This is the printed solution but it seems White can get a ko (see below)
If White takes one stone at a instead of playing 6, Black plays b.
After
After
Black failure diagrams
White wins the capturing race
After jvt: Beautiful problem. I wonder if White can get a ko like this?
Starting as in variation 1b, White plays
B11 at a. This was suggested by Tsukamoto Chiaki on r.g.g. It is similar to variation 1b above.
jvt: After
DaveSigaty: This position comes from game 3 of the 8th Meijin Final between Cho and Otake (Black), 1983-09-28. The black stones in the upper left match the problem but the surrounding stones are different. Cho never tried to kill Black. Did he miss a chance or did he correctly read out that Black lives?
After
BobMcGuigan: I think it is interesting to see how the problem position arose. It started with a very common joseki sequence, as in this diagram, and the position at issue in the Cho-Otake game resulted from natural middle game moves around this shape.
Charles A closely related position arose in a game Zhao Wendong?-Xie He (B) 1995-01-12, first from this sort of shape:
and then later fighting to give:
This is somewhat related to connecting along dame and one group wins. jvt: Do you have a reference to the book / page by Fujisawa Shuko where this problem comes from? I'd like to add a link in Errata In Books. BobMcGuigan: It is problem number 162 from the book "Shuuko Sousaku Tsumego Kessaku Shuu" by Fujisawa Shuko, published by the Nihon Ki-in in Japan, 1980. The title means "A Collection of Original Tsumego Masterpieces by Shuuko". I can't resist mentioning that the word kessaku (masterpiece in the title) could, in other contexts mean "blunder". This is a copy of the living page "Bob's problem solution" at Sensei's Library. ![]() |