Biggest Known Eye Space for which there is a Nakade / Solution 1

[Diagram]

Failure

Well, the applet doesn't seem to work so... lemme try this. B1 takes white+circle (any alternative?), W2 threatens the whole group, so B3 has to connect at white+circle, and W4 finishes it off? Have I missed something here?

[Diagram]

Solution (4 at marked stone)

unkx80: Black sacrifices one more stone and plays atari at B3.

[Diagram]

Solution

B5 and B7 capture four white stones (including W6). Interestingly the eye space of the White group at the top is not enough to make two eyes. If White a then Black b (bulky five), if White c then Black b (Pyramid Four).

[Diagram]

Solution - White?

Jasonred- ah, I stopped thinking once I saw Black's entire structure there die... I was also wondering about the whole title for this page! (why it's about eye spaces) but ... I was wondering about this following sequence? After W8, are a and b miai for life?

unkx80: No. Check out nakade. Also check out some of the Beginner Exercises.

Note: White dies in gote after W8. That is to say, after W8, Black can play tenuki and White is still dead.

[Diagram]

Black kills White?

Jasonred: Let me try this, for Black to kill White... is this the correct sequence? Is B5 in the diagram (Solution) a nakadeafter which White should just play tenuki?

Dieter: The point is, White is dead. In order to prove/disprove that, we have to verify what happens if White goes first, not Black.

[Diagram]

Black kills White? (2)

For instance: W1 then B2 makes miai of a and b: White needs both a and b to live, so Black can always play one of them to kill. Verify there is no eye in the corner.


[Diagram]

From 16 to 17 eye space nakade?

Jasonred- verify this for me, but, ummm... modifying the above, I think I got a nakade for a 17-space eye... is this correct?

jvt: This eye space cannot possibly result from a capture. If such eye spaces are allowed, it is easy to add cutting points and stones in atari.

[Diagram]

Construction

Dieter: The eyespace and ensuing nakade you propose, would have to come from this capture. In your diagram, however there is a stone at a but then Black gets a double capture and is out of trouble already.

[Diagram]

Construction 2

Moreover, to get there, Black would have to play B1 here. That's not a smart thing to do: Black will much rather play at W2 or at one of the ataris.


This is a copy of the living page "Biggest Known Eye Space for which there is a Nakade / Solution 1" at Sensei's Library.
(OC) 2009 the Authors, published under the OpenContent License V1.0.
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