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OngoingGame2Move174

 

Solution To OngoingGame2 - Move 174
  Difficulty: Advanced   Keywords: Problem

[Diagram]
Diag.: Ongoing game 2 - B cannot block

After W1 black tries to capture her stone with B2. White answers calmy at 3.

What shall B do next?


[Diagram]
Diag.: B's block - variation 1

If black plays at 1, white cuts through his position with 2. B has to answer at 3 and 5, otherwise he loses the 6 black stones on the left.

So, applying the proverb "Your opponents good move is your good move" black might try to protect against white playing at 2.


[Diagram]
Diag.: B's block - variation 2

So let's assume that black plays B1 here.

Next white plays 2.

Can you read out the ladder?


[Diagram]
Diag.: variation 2 - the short ladder (5 connects)

If black uses 3 to capture the white stone, he loses very quickly. After 7 the black stones are lost.


[Diagram]
Diag.: variation 2 - the long ladder (7 connects)

If black uses 3 to run, the ladder becomes longer.


[Diagram]
Diag.: variation 2 - the long ladder (continued)

After white 4 black's group is in damezumari and black cannot connect (white would capture at 'a').



So, black cannot capture the original white stone, but instead has to save his own stones.

[Diagram]
Diag.: Ongoing game 2 - B plays it safe

Note that white still has some good aji around this area.



--ArnoHollosi


Lo! Behold AvatarDJFlux!! Praise to the Finder Of The Much Difficult Black Answer At 175!!!
;-)))



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