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Subject: Re: changes in the last minute before world championship

Author: Uri Blass

Date: 13:10:53 08/15/05

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On August 15, 2005 at 16:00:56, Dann Corbit wrote:

>On August 15, 2005 at 15:49:30, Uri Blass wrote:
>
>>I read the following comment:
>>"It's easy to broke things in a complex system like a chess program and it's
>>very dificult to discover bugs, they are likely not to be discovered with just a
>>few days of testing."
>>
>>My opinion is that it is not correct.
>>
>>There may be changes that it is a big risk to do at the last moment without
>>testing but at least some evaluation changes or implementing contempt factor can
>>be done with no risk by good programmers.
>>
>>part of the test may be playing blitz games and if implementing the contempt
>>factor does not cause problems in blitz games and give the expected result then
>>the programmer can be almost sure that there is no problem with the new code.
>>
>>There is no need to use more than some hours of testing to get hundred of 1+0
>>time control games and if change in the evaluation did not cause problems in 1+0
>>time control games it will probably not cause problems also in longer time
>>control(changes in the search seems to me something with bigger risk).
>>
>>Do you have examples that show that my opinion is wrong and changing things in
>>the last moment cause problems in games inspite of the fact that no problem were
>>discovered in tests.
>>
>>Note that I think that even changes in the move generator or in the search that
>>seem more risky to me have probability of less than 1% to create problems if few
>>hours of testing do not discover bugs in case that the programmer has good tools
>>to detect bugs.
>>
>>What is your opinion?
>>Is it risky to make changes in the last moment or is it only a problem of
>>programmers who did not generate good tools to detect bugs and need to play many
>>games at long time control for that purpose.
>
>Without testing, it is clearly a mistake.
>
>That is not an opinion, it's a fact.

I am not saying without testing but without using more than few hours for
testing.

Uri



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