[Computer-go] New Crazystone - when again?

terry mcintyre terrymcintyre at yahoo.com
Mon Apr 25 10:04:32 PDT 2011

Now I know why I am still a kyu player, I missed that obvious threat. It can't 
be ignored.

It not only captures a lot of white stones, but resurrects black stones, which 
leads to the death of a lot more white stones. 

I can't see a white counterthreat big enough to match such a huge loss.

The error comes several moves back. More than once, white lost a liberty and 
tenukied instead of taking a liberty from black. My hat is off to whoever solves 
this capturing-race issue for bots. 

 Terry McIntyre <terrymcintyre at yahoo.com>

Unix/Linux Systems Administration
Taking time to do it right saves having to do it twice.

From: David Fotland <fotland at smart-games.com>
To: computer-go at dvandva.org
Sent: Mon, April 25, 2011 12:48:02 PM
Subject: Re: [Computer-go] New Crazystone - when again?

Many Faces takes the ko, but with only 24% win rate.  It expects the ko threat 
at F10, which can’t be ignored.
From:computer-go-bounces at dvandva.org [mailto:computer-go-bounces at dvandva.org] On 
Behalf Of terry mcintyre
Sent: Monday, April 25, 2011 9:39 AM
To: computer-go at dvandva.org
Subject: Re: [Computer-go] New Crazystone - when again?


From:Rémi Coulom <Remi.Coulom at free.fr>

> There is at least one huge blunder at the end of that game:
> http://files.gokgs.com/games/2011/4/23/bonobot-ishidasaki-2.sgf

Yes, this is the one where bonobot resigned in (I believe) a clearly won 
position. Take the ko, ignore one threat, play M12, ignore a 2nd "free move", 
play L10 and take the L9 stones, finally respond to black's two free moves, and 
I believe bonobot was still clearly ahead. Dan-level players seemed to be of the 
same opinion. In any event, it was certainly playable, not the best time to 

I'd be interested if dan-level players read something different; I'm not in that 

In any case, it looks like a great program! I wish you every success in 
repairing these flaws and making still more progress. 

I'm also interested in seeing how well bonobot does with longer time settings. 


Terry McIntyre
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