Beginners Endgame Exercise 1 / Attempts

OK i'll have a go for W!

This ends in gote for W

[Diagram]

gote attempt



Bill: Too deep.

[Diagram]

B4 captures



And this ends in sente but steals much less territory

[Diagram]

sente attempt

unkx80: Sente but loses points. No need to think too hard...



[Diagram]

sente attempt

bobulatorm Oh! Of course! Is this right?

[Diagram]

sente attempt

argh i've just seen another route although i think B should play 2 at 5. will try again later. sorry for my lack of reading skills!

[Diagram]

yes

Dieter: yes, this should be the solution

Bill: Yes, B2 is the right reply to W1. :-)

[Diagram]

ichundso?: i think this is very very slightly better, because "a" is a ko threat that destroyes a black ko threat at "b"


What about when Black plays first?

[Diagram]

If black goes first

Dieter: If Black goes first, he wins two points and leaves a half-point ko. The local tally is 1, so the miai value is 2 1/2 ??

Bill: It has been a while, so I'll reply.

[Diagram]

Black to play

B1 is orthodox play. Later, W4 - B5 is sente.

The hane, B4, is correct only in very special circumstances, where Black is komaster and the ambient temperature is very low. To win the ko Black would need some very large ko threats, but then Black could pick up an extra point.




Last question: How much is this White sente worth?


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