# Tsumego From Games 55 / Solution

Sub-page of TsumegoFromGames55
corner

This also lives.

Dieter: Yes, but with less points. The question concerned the status of the White group if White plays elsewhere.

ilan: The Oracle of ilan answered your original question and will now move on.

Dieter: Maybe someone else wants to try if the group could live without White answering locally.

My attempt

Grauniad: I don't see how White can live after a Black move at the same point.

prevents ko and makes miai of a and b. This and move are not obvious to me, and I suspect there may be holes in the reasoning.

Ed?: White is alive here at 'a' or 'b'.

ko

ed?: here threatens to separate the the white stones by pushing through at . If the exchange of for is not sente then black can kill.

ko

White throws in with to make a ko. White will play at either point 'a' to finish the ko.

Alternative for black 7

White is alive here.

Alternative for black 5

White is alive after

Increasing eye space

If the exchange of for is not sente for white black can kill.

approach ko

Black can get a sente seki by exchanging 'a' for 'b'. Playing 'c' instead leaves open the possibility of a ko. White 'b' in response to 'c' leaves a 1000 yr ko, although if white starts it early by throwing in at 'a' it is a direct ko for white but black will need a lot of approach moves. If black can play 'c' and white tenuki's, black 'b' makes it a direct ko.

This diagram seems to be white's best option.

Playing underneath 1

Here white dies. at would give ko after black pushes through at .

Playing underneath 2

'a' and 'b' are miai so white must fight the ko

Not clever

Resisting with is clearly bad, white collapses.

Seki

This attack leads to seki. at 'a' would lead to ko. Again white is dead if the exchange of for isn't sente.

Seki

If at then white lives with territory at 2.

(Hicham): Isn't 4 atari?

Ed? True white needs to exchange 'a' for 'b' before playing

corner

[alternative: alive --Dieter

Tsumego From Games 55 / Solution last edited by Unkx80 on July 8, 2008 - 10:52