Strange Sekis/ Solution 1

Sub-page of StrangeSekis
[Diagram]

"two dead, only one capturable" -- Solution

W3 at WC prevents eyes.

W5 left of WC - no time for WS.

B6 at WS makes life.

White gained . . . 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 . . . ;-)

% $$B "two dead, only one capturable" -- (Wrong) Resolution if B is first
% $$ ------------------
% $$ | . O . 1 . 2 . X O
% $$ | O O X X X X X X O
% $$ | . X O O O O O X O
% $$ | 3 X O , . . O O O
% $$ | O X O . . . . . .
% $$ | O X O . . . . . .
% $$ | O X O . . . . . .
% $$ | X X O . . . . . .
% $$ | O O O . . . . . .
%
% $$B "two dead, only one capturable" -- (Wrong) Resolution if B is first (cont)
% $$ ------------------
% $$ | . O 6 X 4 O b X O
% $$ | O O X X X X X X O
% $$ | a X O O O O O X O
% $$ | X X O , . . O O O
% $$ | . X O . . . . . .
% $$ | 5 X O . . . . . .
% $$ | . X O . . . . . .
% $$ | X X O . . . . . .
% $$ | O O O . . . . . .
%
% B has a to force b later.
[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).


This is a copy of the living page "Strange Sekis/ Solution 1" at Sensei's Library.
(OC) 2004 the Authors, published under the OpenContent License V1.0.
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