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Path: utzoo!watmath!clyde!burl!ulysses!mhuxl!houxm!hou2f!hoj909
From: hoj909@hou2f.UUCP (C.BOHRINGER)
Newsgroups: net.games.go
Subject: Re: Answer: Live & Death problem #8.
Message-ID: <197@hou2f.UUCP>
Date: Fri, 20-Apr-84 10:00:23 EST
Article-I.D.: hou2f.197
Posted: Fri Apr 20 10:00:23 1984
Date-Received: Sat, 21-Apr-84 01:16:26 EST
References: <446@dual.UUCP>
Organization: AT&T Bell Labs, Holmdel NJ
Lines: 45

<     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