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Biggest Known Eye Space for which there is a Nakade
The bigger the eye shape gets, the less likely it is that all surrounding stones can be killed. There is no known nakade for an eye shape (resulting from a capture) bigger than 16 points. (Igo Hatsuyoron)
Here is
Well, the applet doesn't seem to work so... lemme try this. 1 takes the circled stone (any alternative?), White 2 ataris the whole group, so Black has to connect at the circled point, and White 4 finishes it off? Have I missed something here?
unkx80: Black sacrifices one more stone and atari at 3.
Black 5 and 7 captures four white stones (including White 6). 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 (farmer's hat eyespace).
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 8, 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 White 8. That is to say, after White 8, black can tenuki and White is still dead.
Jasonred: Okay, lemme try this, for Black to kill White... is this the correct sequence? Is move 5 in diagram (Solution) a nakade after which White should just 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.
For instance: White 1 then Black 2 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.
Jasonred- verify this for me, but, ummm... modifying the above, I think I got a nakade for a 17 eye space... 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.
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.
Moreover, to get there, Black would have to play 1 here. That's not a smart thing to do: Black will much rather play at 2 or at one of the ataris. This is a copy of the living page "Biggest Known Eye Space for which there is a Nakade" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |