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TsumegoFromGames9
TFG9PlayingHane

 

TFG9 - What the Finnish Dan Players Suggested
    Keywords: Life & Death, Problem

[Diagram]
Diag.: Suggested sequence


[Diagram]
Diag.: What next?

I have been looking at the suggestion but so far can not find a win for White here. What does White do after Black 4? One important question that is open is whether White wins if everybody lives. DaveSigaty



[Diagram]
Diag.: At worst a ko 1 - 5?

Something like this ko (6 - 10)? See below. DaveSigaty


[Diagram]
Diag.: A. White's brute force approach

White 7 at 3
Black 10 at 4 and wins on the right with a, ignoring any ko threat.


[Diagram]
Diag.: B1. W's play on the right

White 9 at 5

The ko threat at 10 and a second at a are available in many of the variations and make it possible for Black to fight hard. The position on the rest of the board would help to evaluate this situation correctly.


[Diagram]
Diag.: B2. White's play on the right - cont'd

White 5 at the marked white stone
Black 8 at 2. Whenever White retakes the ko in the corner, Black will recapture at the marked black stone and ignore any ko threat.


[Diagram]
Diag.: C. Other alternatives for White from here?


[Diagram]
Diag.: What next: maybe here?

dnerra: Whew, that is really a tough challenge to SL! Here are my two cents:

Maybe the idea of the "finnish sequence" is to create a damezumari as with White 1 in this diagram. Note that the white dragon virtually has five liberties (I think). At the moment I would expect a result similar to Dave's above, but I have to read further.

OK, just 48 more, and we have a $ :-)

AvatarDJFlux Since when a dollar is made of 50c??!?
Now I understand your counting!!!!! ;-)))) -- dnerra: Hmph. Let me say I meant 48 more 2c's, after Dave's and mine above :-)))

Dave: How about this Black 2?

dnerra: Isn't White 3 sufficient then? After White 5, it's a just a liberty counting exercise :-) I think White is one liberty ahead, but maybe I am wrong.

Dieter: Well you are, no ?

dnerra: Ooops yes, I didn't see Black 5. So White has to play at 4 instead of White 2, in case mutual life is sufficient?

go4joy: Isn't White still dead if White at 4, then Black to the right of 4. Doesn't Black still win the semeai?



[Diagram]
Diag.: What next: maybe here?


[Diagram]
Diag.: Alternative?

go4joy: Referring to Dave's third diagram:-


[Diagram]
Diag.: Alternative con't 1

[Diagram]
Diag.: Alternative con't 2

go4joy: This is the best I can come up with. White will need a big ko threat. At least this variation removes Black's local ko threats.

DaveSigaty: Unfortunately this variation has removed White's local ko threats (successive white plays at a and b will create only a temporary seki since the three white stones have no hope for eyes). Unless there is a 60+ point ko threat on the part of the board that is not shown, Black will ignore any threat and live in the upper left. As a result, White 3 looks impossible.



Lucky I had another idea: although is still ko, it is in White's favor.

[Diagram]
Diag.: Lucky's move (Black 4 at 1)

White 1 is surprisingly effective. Black 2 is the only answer. The moves to 7 are forced.


[Diagram]
Diag.: Lucky's move 2

Now there is little Black can do: Black 1 is best, since any other move and White plays 1 herself and wins the semeai. Black 3 makes ko.


[Diagram]
Diag.: Lucky's move 3 (White 4 at the marked stone)

And White takes first.



This is a copy of the living page "TFG9 - What the Finnish Dan Players Suggested" at Sensei's Library.
(OC) 2003 the Authors, published under the OpenContent License V1.0.