[Pachi] Dynamic komi bug ?

Petr Baudis pasky at ucw.cz
Thu Jan 7 03:03:44 CET 2016


  Hi!

On Wed, Jan 06, 2016 at 09:48:07PM +0100, lemonsqueeze wrote:
> I'm trying to understand what happened to a game Pachi played on kgs
> recently:
>     http://files.gokgs.com/games/2015/12/31/Yamoz-pachipachi-8.sgf
> 
> There's a big difference in strength and no handicap, so Pachi manages to
> kill 2 groups on a big scale and is winning by about 100 points. Clearly
> there should be no way to turn the game around at this point, but near the
> end around move 217 Pachi makes a massive blunder, gets one of his
> surrounding groups captured and loses the game (!)
> 
> It's playing with maximize_score to make it more human-like, and looks like
> it's trying to increase its margin even more instead of playing a safe move:
> If I load the position in gogui it does the right thing, but in the game
> winrate is 0.51 with extra komi 95 at this point, and if passed
> extra_komi=95 it does indeed go insane again =)
> 
> Not sure what's going on here, and how to fix this...
> Does this look like a dynamic komi bug ?
> Or it doesn't see the danger maybe ?

  This kind of cases is why maximize_score is not the default :-) - yes,
that likely looks like a dynamic komi bug.

				Petr Baudis


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