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

From: Christian Anthon
Subject: Re: [Bug-gnubg] How to calculate snowie error rate from logged databasedata
Date: Mon, 17 Aug 2009 12:24:57 +0200

Please do, and report back, I remember being a bit confused myself
when I implemented the reporting.


On Mon, Aug 17, 2009 at 11:29 AM, Misja Alma<address@hidden> wrote:
> 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
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