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Subject: Re: Junior 8 doesn't see this simple mate

Author: Sune Fischer

Date: 14:56:49 08/21/03

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On August 21, 2003 at 17:40:11, Uri Blass wrote:

>On August 21, 2003 at 17:27:05, Sune Fischer wrote:
>
>>On August 21, 2003 at 17:21:06, Uri Blass wrote:
>>
>>>>If you had a pruning rule that gained 50 elo in all games but made blunder moves
>>>>every time there was a quadrople pawn on the board, would you do the pruning?
>>>
>>>I believe that if I have that pruning rule then I can easily change it not to
>>>make the blunder without significant difference in strength.
>>
>>But for the sake of argument, suppose you couldn't.
>>Which is more important to you?
>
>increasing strength.

So I guess we fundamentally agree it is not an unbreakable principle if the
reward is large enough.

>Junior can also do verifying search with different bounds(-infinite,infinite)
>when it get position when one side has only a bishop and in the rare case of
>getting mate value it can change the assumption that bishop cannot mate for the
>rest of the search.

This is going to get complicated if the position is not yet at the root, but a
few plies deep.

>>In which case the mate is going to need 40 plies, so you'll miss it anyway.
>
>mate in 3 is 5 plies(5*4=20) and it is possible to get 20 plies in the endgame.
>it can be even less than 5 plies if you do checks in the qsearch and in this
>case it can be translated to 16 plies.

I bet people will still be complaining that your program is unable to solve
simple mates in 6 :)

-S.
>Uri



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