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Path: utzoo!watmath!clyde!burl!ulysses!harpo!seismo!ut-sally!mordor!dual!bill
From: bill@dual.UUCP
Newsgroups: net.games.go
Subject: Re: Re: Answer: Live & Death problem #8.
Message-ID: <462@dual.UUCP>
Date: Mon, 23-Apr-84 19:08:53 EST
Article-I.D.: dual.462
Posted: Mon Apr 23 19:08:53 1984
Date-Received: Tue, 24-Apr-84 19:11:39 EST
References: <446@dual.UUCP> <197@hou2f.UUCP>
Organization: Dual Systems, Berkeley, CA
Lines: 61

<<     Here black is to play first and try to kill white.
<<     Can he do it? How?
<< 
<< 	A  B  C  D  E  F  G  H  J  K
<<    10   .  .  .  .  .  .  .  3  2  1
<<     9   .  .  .  .  .  .  .  @  @  O
<<     8   .  .  .  O  .  O  O  @  O  .
<<     7   *  .  .  .  .  .  @  O  .  O
<<     6   .  .  .  .  .  .  @  O  O  O
<<     5   .  .  .  .  .  .  @  @  @  @
<<     4   .  .  .  .  .  .  .  .  .  .
<<     3   .  .  .  .  .  .  .  .  .  .
<<     2   .  .  .  .  .  .  .  .  .  .
<<     1   *  .  .  .  .  .  *  .  .  .
<< 
<< Black = @  White = O  Answer moves = 1, 2, 3, ...
<< =========================================
<< 
<<     The best that black can do here is to force a ko on white. After black
<< plays 3) H-10 white cannot fill at K-10. White must therefor kill the black
<< stones by playing at G-9,10. As you can see this is a two step ko for white.
<< 
<<     Black can be happy knowing that, even if he looses the ko, he has made
<< the best use of his 'dead' stones. Remember 'losing' the ko means 2 moves in
<< a row someplace else.

< Why can't black, after 4) G-9, continue with 5) K-10 taking J-10,
< after 6) G-10 play 7) K-8 taking K-9 resulting in
< 
< 	A  B  C  D  E  F  G  H  J  K
<    10   .  .  .  .  .  .  O  @  .  @
<     9   .  .  .  .  .  .  O  @  @  .
<     8   .  .  .  O  .  O  O  @  O  @
<     7   *  .  .  .  .  .  @  O  .  O
<     6   .  .  .  .  .  .  @  O  O  O
<     5   .  .  .  .  .  .  @  @  @  @
<     4   .  .  .  .  .  .  .  .  .  .
<     3   .  .  .  .  .  .  .  .  .  .
<     2   .  .  .  .  .  .  .  .  .  .
<     1   *  .  .  .  .  .  *  .  .  . ,
< 
< and kill white in the next move with 9) J-7 ?
< 
<  Christian Bohringer

    What!
    White give up without a struggle!
    Where is your fighting spirit?

    Take another look...

    After black takes the stone at J-10 (ko) white will make a ko threat
somewhere else on the board. If the threat is small (less then about 20 
points) black will take the next stone at K-9. But if the threat is large
(greater then say 25-30 points) black will answer and allow white to retake
the ko. Thus is a ko fight born.

    Is this clear to everyone? If not or if I am full of hot air let me know.

Bill Kanawyer
{ucbvax,amd70,ihnp4,cbosgd,decwrl,fortune,zehntel}!dual!bill