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Nice problem

https://lifein19x19.com/viewtopic.php?t=15999

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Nice problem

Posted: Fri Aug 24, 2018 10:14 am
by Gomoto
White to play
problemlevel.jpg
problemlevel.jpg (217.07 KiB) Viewed 5083 times
Level 1 (easy)

What is whites best play?

hint:
(White has won this game already but lets suppose he wants to win with > 150 points)

Level 2 (difficult)

How does black defend?


Have fun!

Posted: Fri Aug 24, 2018 11:43 am
by EdLee
Hi Gomoto,
Initial feeling is W drops at B12,
cap race, big eye v. small eye (with 0.5 ko).

For B to defend, do you mean after W drops B12,
or instead of B's current move A17 key point ?
Hmm, maybe the same spot, ladder at B12...

Re: Nice problem

Posted: Fri Aug 24, 2018 12:05 pm
by Gomoto
@EdLee
(Solution Easy Problem)
After white B12, is it possible to defend as black? :)

Re: Nice problem

Posted: Fri Aug 24, 2018 1:17 pm
by HermanHiddema
Black descends at B12 to create semedori. Black must immediately capture white's group in gote. So it gains a few points in sente for white, who can then go on to take the next biggest endgame at O1.

Re: Nice problem

Posted: Sat Aug 25, 2018 10:14 am
by Bill Spight
Best play depends upon the method of scoring. :)

Re: Nice problem

Posted: Sat Aug 25, 2018 11:28 am
by Gomoto
Thank you Bill for your very detailed solutions.
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