[computer-go] How to kill white the hard way

[Darren Cook <darren@xxxxxxxxx>]

For some light relief from recent discussions... I've been working on 
enhancing my tac search code with more semeai knowledge. Given this ladder 
problem (9x9 board):

 - - - - - - - - -
 - - - - - - - - -
 - O O - - - - - -
 - - - - - - - - -
 - - # - - - - - -
 - # O - - - - - -
 - # O # - - - - -
 - - # - - - - - -
 - - - - - - - - -


It eventually crashed on this position:

 O # - # # O O O -
 - O # # - # O # O
 O O O # # O O # -
 O - O # O O # - #
 # O - O O # # # O
 # # O O # O # - O
 - # O # # O # # #
 # - # - # O - O #
 # - # - # O # O -

Black was actually doing well until the ladder got right up to the top-right 
then it decided it wanted to fight a semeai instead of just finishing off white.

The irony of the terminal position is that if black had a lot of ko threats 
he could actually capture the original white chain and get the answer right 
:-). (actually now I look again I'm not so sure: that is quite an impressive 
problem - is it a 4-step ko?)

Darren

_______________________________________________
computer-go mailing list
computer-go@xxxxxxxxxxxxxxxxx
http://computer-go.org/mailman/listinfo/computer-go