Nick Wedd wrote:
- the winners of last Sundays tournament on KGS. My report is at
http://www.weddslist.com/kgs/past/27/index.html. I expect people will
soon report the many misprints in it, as usual :)
Nick
Hi,
Thanks Nick for your report.
Here is what I found after analyzing the blunder of Crazy Stone against
MogoBot19. In fact, the capture at F18 was not pruned. But White
extension at F18 after Black L10 was. The reason is that F18 is a Ko shape.
The urgency of shapes was learnt from game records that contain many Ko
fights. The consequence is that capturing in a Ko shape had a very high
urgency, whereas extending in a Ko shape had a very low urgency. So
black thought white would never extend to F18 before being captured.
I now have added Ko-related features to Crazy Stone pattern-learning
algorithm. Crazy Stone now makes the difference between a Ko extension
and a non-Ko extension in the shape at F18, and plays much better thanks
to this additional knowledge.
Rémi
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