Strange Sekis/ Solution 1

Sub-page of StrangeSekis
[Diagram]
Either-or-death -- Solution  

W3 at white+circle prevents eyes.

W5 left of white+circle - no time for white+square.

B6 at white+square makes life.

White has . . . 19 - 8 = 11 points ('a' is Black's option). If White goes for the other side, it's only 9.

Robert Pauli: Wouldn't really call it seki.


Attemps

WillerZ: My answer. It is indeed odd.

Robert Pauli: The position, or . . . ;-)

[Diagram]
"two dead, only one capturable" -- Resolution if B is first  

Robert Pauli: Know what I really hate: if stones are gone before they're captured . . .

[Diagram]
"two dead, only one capturable" -- Resolution if B is first (cont)  
[Diagram]
"two dead, only one capturable" -- Resolution if B is first (cont)  
[Diagram]
"two dead, only one capturable" -- Resolution if B is first (cont)  
[Diagram]
"two dead, only one capturable" -- Resolution if B is first (cont)  

B can use all 6 of these moves for ko threats if there is a big enough ko. But otherwise, he should leave well alone.


[Diagram]
"two dead, only one capturable" -- Resolution if W is first  
[Diagram]
"two dead, only one capturable" -- Resolution if W is first (cont)  
[Diagram]
"two dead, only one capturable" -- Resolution if W is first (cont)  



Later Black has 'b' to force W5 and 'a' to force 'b'.

So yes, under Japanese rules, the corner is 5 points to B and 18 to W, if it's unresolved at the end of the game.

f3etoiles Well, not exactly :-) In Japanes ruling, it will be counted as seki if it is left unresolved. So White should act (and capture the upper group, as it is slightly bigger).

Robert Pauli: Right, but change his "end" to "stop" and he's right too. Just wonder how he got the "right" figures by taking the wrong side? Guess he assumes 1-1 is White's anyway (19 - 1 = 18) and, just like I first did, forgets three white captives (8 - 3 = 5).


Strange Sekis/ Solution 1 last edited by Bill on December 15, 2008 - 21:18
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