BQM 574

  Difficulty: Advanced   Keywords: Opening

Is the presence of B3 in a diagonal fuseki as a ladder breaker going to cause white difficulty in her selection of the taisha joseki in the upper right?

It's hard to give a quick answer. I am no authority, but I think it would be interesting to discuss an example. Feel free to move this thread. Ladders may be considerations in tasuki fuseki, but the taisha is a bit of a digression. -Calvin

[Diagram]
Ishida Yoshio (W) vs. Rin Kaiho 1988  

Calvin: There are actually many examples of pro games where the the double approach is made regardless of the situation in the opposite corner, so it would appear that black has no clear refutation. (Remember than the double approach doesn't mean the taisha is played). Ishida seems to have done okay playing this white+circle agains Rin Kaiho, because white won this game. According to Kogo's Joseki Dictionary, white should really have ladders to play this line, but which ladders? It says black can play a now to simplify the position. (Rin Kaiho played B8 instead.)

[Diagram]
Variation  

Calvin: With B3, black is threatening to capture both of the marked white groups. Since the ladder works, white can't defend both sides, so he has to capture at a or play a ladder breaker at say, b.

[Diagram]
An early choice involving a ladder  

Calvin: Here is another variation, where Kogo's says black needs a ladder to connect on the outside at B1.


BQM 574 last edited by 2.30.94.120 on October 5, 2017 - 19:22
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