Beginner Exercise 47 / Solution

Sub-page of BeginnerExercise47
[Diagram]

White first to create a ko.

splice: W1 creates a ko. Black cannot respond at a because of shortage of liberties. Any response that does not threaten W1 (except b, discussed below) will capture the two black stones at the right in a snapback (White b, Black a, White b).

[Diagram]

Possible

B2 connects and W3 sets up the ko. Black must take the ko, lose the four stones at the bottom, or connect them and lose the whole group. Ko it is :0

elflores?: Could someone please show how this plays out?
Phelan: It would play out like this:

[Diagram]

Black fights Ko for life

Phelan: Black must fight this ko to live with the group.

[Diagram]

If black connects

Phelan: If black connects with B1, white W2 creates a killing shape inside black's eyespace.

[Diagram]

If black connects

Gorobei: I think you mean: if black connects with B1, white W2 kills.

Zyflair: Regardless, both moves kill, but W2 is no doubt much quicker.

Phelan: Heh, yeah, I missed that. Silly me. Thanks. :)

[Diagram]

Possible too

Straightforward ko sequence.

ichundso?: This would be worse for black because black got to find the first ko threat.


har1s?: I don't see any profit for White: Black still creates two eyes anyway?

HolIgor: In the last diagram White threatens to capture four black stones and Black cannot connect. Black cannot capture W3 back because of ko rule. The only solution is to make a large threat elsewhere, which sets up a ko. Black is better off in the second diagram, because White has to look for a ko threat first (try to get first capture in a ko).


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