Re: [Bug-gnubg] How to calculate snowie error rate from logged databasedata

[Misja Alma]

Hi,

Thanks for looking into the problem. So the snowie_moves number is correct then.
But the product of snowie_moves and snowie_error_rate_per_move is
still different than what gnubg reports itself.

Maybe I'll have a look into the code myself when I find some time,
'cause I would really like to be able to query some average Snowie
error rates from my database.

Cheers,
Misja

2009/8/17 Ian Shaw <address@hidden>:
>
>
>> -----Original Message-----
>> From: address@hidden
>> [mailto:address@hidden
>> On Behalf Of Misja Alma
>> Sent: 15 August 2009 15:54
>> To: bug-gnubg
>> Subject: [Bug-gnubg] How to calculate snowie error rate from
>> logged databasedata
>>
>> Hi,
>>
>> I've been trying to reconstruct my Snowie error rate from a
>> match that I've logged in the database with gnubg.
> [snip]
>> I then checked what the value for snowie_moves was for my
>> match, and it was the total number of (forced or unforced)
>> moves of me and my opponent added up.
>
> I can't help with the rest of your query, but I do know that this is
> correct. Snowie uses the sum of your and your opponent's moves as the
> divisor. Forced or unplayable moves (such as being closed out) are
> counted.
>
> This is the main reason that gnubg's gradings are so much tougher than
> Snowie's. #
>
> Lot's of people dislike Snowie's method, because it is counter-intuitive
> to count your opponents' moves as the divisor for your own error rate.
> However, it is the rate that people are most familiar with (which I
> suppose is why you are trying to extract it.) Douglas Zare also wrote an
> interesting article at GammonVillage in which he argued in its favour.
>
> -- Ian
>
>
>