RE: [Bug-gnubg] Largest swing yet between 0-ply & 2-ply

[Ian Shaw]

> -----Original Message-----
> From: Joern Thyssen
> Sent: 08 April 2003 13:00
> 
> On Tue, Apr 08, 2003 at 12:45:56PM +0100, Ian Shaw wrote
> > This is the first time I've seen a swing of over 0.5 between 0-ply &
> > 2-ply. I thought you, particularly Joseph, would be interested. It's
> > even larger on a centred cube, at 0.547.
>
> If you look the at the cubeless equities they hardly change for bar/21
> 6/5: 0.231 to 0.217. The difference is much larger for the 
> the safe play 0.063 to 0.347.
>
> I don't find it particular disturbing. I think you can find many
> positions where is really vital to look 2 or more plies ahead to get
> accurate equities. 

I don't find it particularly disturbing either. Your point about the safe play 
being almost unchanged is a good one. 
I posted it mainly because I know one of Joseph's training methods is to use 
2-ply evaluations to train 0-ply. I think the slotted position is still an 
interesting example, even if the discrepancy reduces to "only" 0.284 cubeless. 
Particularly since it was a mistake made by a human in OTB play. 

Just out of curiosity, what's the largest discrepancy you've found between 
0-ply and 2-ply? Joseph? Anyone?

--Ian