[net.games.go] Answer: Life & Death problem #12.

bill@dual.UUCP (Bill Kanawyer) (07/06/84)

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>     Black has a way to kill white in the corner. But look out... it's not
> what you think. Sometimes one need to go the long way around to reach a goal.

	A  B  C  D  E  F  G  H  J  K
   10   *  .  .  .  .  .  *  .  .  .
    9   .  .  .  .  .  .  .  .  .  .
    8   .  .  .  .  .  .  .  .  @  @
    7   .  .  .  .  .  .  .  @  .  O
    6   .  .  .  .  .  .  .  @  @  O
    5   .  .  .  .  .  @  O  @  O  O
    4   *  .  .  .  .  .  @  O  @  4
    3   .  .  .  .  @  .  @  O  O  3
    2   .  .  .  .  .  @  O  O  .  5
    1   .  .  .  .  .  @  @  2  1  .

Black = @  White = O  Answer = 1, 2, 3, ...
---------------------------------------

    How many of you picked K-2 as the first move?
    
    Well black needs to make the move at J-1 first otherwise white can force a
ko. White must answer at 2 or he dies right away. Then black plays at the key
position of K-3 and white is finished. Note that white must take the black
stone with 4 or black kill the lower white group with his next move.

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