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Subject: Re: SSDF Deep Fritz - Junior 6: 1- 0 Now: 7,5 - 13,5

Author: Uri Blass

Date: 04:46:53 01/07/01

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On January 07, 2001 at 07:34:20, Ralf Elvsén wrote:

>On January 06, 2001 at 23:51:59, Uri Blass wrote:
>
>>On January 06, 2001 at 21:02:08, Ralf Elvsén wrote:
>>
>>>On January 06, 2001 at 08:51:12, Uri Blass wrote:
>>>
>>>>On January 06, 2001 at 08:46:57, Jorge Pichard wrote:
>>>>
>>>>>You should let that match continue up to 50 games, instead of 40 games.
>>>>>
>>>>>Pichard.
>>>>
>>>>The number of games should be decided before the match and not during the match.
>>>>
>>>>Uri
>>>
>>>Why is that?
>>>
>>>Ralf
>>
>>There is an obvious reason.
>>
>>people may try to get the result that they want by playing different number of
>>games and it is not fair.
>>
>>Uri
>
>If the result at the end of a test isn't liked by a tester
>and he plays more games, won't the result just become more accurate?
>(Assuming he always reports all games played.)
>
>Ralf

No

Assume that 2 programs is equal and the tester prefers program A.

After 40 games the result is 22-18 for B and the tester decides to play more
games and to stop only when A is leading.

If the result is 22-18 for A the tester decides to stop the match.

A is going to win in both cases not because it is better but because the tester
manipulated the results by deciding when to stop during the match.

Uri



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