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  Topic: First post (and FailHigh question!)
Chan Rasjid

Replies: 89
Views: 14131

PostForum: Computer Chess Club: Programming and Technical Discussions   Posted: Sat Jun 22, 2013 9:04 am   Subject: Re: First post (and FailHigh question!)
Hello Patrice,


You did mentioned earlier that your program has an old bug about wrong mate scores that you could not resolve - so you disabled mate score adjustment. You cannot do a half-measured ...
  Topic: First post (and FailHigh question!)
Chan Rasjid

Replies: 89
Views: 14131

PostForum: Computer Chess Club: Programming and Technical Discussions   Posted: Fri Jun 21, 2013 9:40 pm   Subject: Re: First post (and FailHigh question!)
Hello Thomas,

Hi Chan,

there is no bug and the engine did not see beyond its horizon. The Mate in 12 was found at general depth 18 but "selected depth" 24. So it extended certain line ...
  Topic: First post (and FailHigh question!)
Chan Rasjid

Replies: 89
Views: 14131

PostForum: Computer Chess Club: Programming and Technical Discussions   Posted: Fri Jun 21, 2013 9:29 pm   Subject: Re: First post (and FailHigh question!)
Hello Patrice,

Hello,

Don't know if it helps, but for me one part of the problem with wrong mate scores was in null moves pruning.
In my condition to prevent zugzwang positions, I used the tota ...
  Topic: First post (and FailHigh question!)
Chan Rasjid

Replies: 89
Views: 14131

PostForum: Computer Chess Club: Programming and Technical Discussions   Posted: Fri Jun 21, 2013 3:31 pm   Subject: Re: First post (and FailHigh question!)
Hello Sven,

Of course they have to be different positions otherwise there could not be any "amplification". We could substitute 'OM' whenever we want to say 'amplification' if we like. : ...
  Topic: First post (and FailHigh question!)
Chan Rasjid

Replies: 89
Views: 14131

PostForum: Computer Chess Club: Programming and Technical Discussions   Posted: Fri Jun 21, 2013 10:32 am   Subject: Re: First post (and FailHigh question!)
Hello Sven.

This was what you wrote earlier :

4) The grandparent of A1, which is at ply=10, gets back "+(infi-17)", fails high, and stores "+(infi-7)" as lower bound in the T ...
  Topic: First post (and FailHigh question!)
Chan Rasjid

Replies: 89
Views: 14131

PostForum: Computer Chess Club: Programming and Technical Discussions   Posted: Fri Jun 21, 2013 5:08 am   Subject: Re: First post (and FailHigh question!)
Hello Sven,

Besides any misundertanding on our "disputes", only one of us is right; but it is not really important as we are not vying for the Nobel award! Or to head ICGA!

We all lear ...
  Topic: First post (and FailHigh question!)
Chan Rasjid

Replies: 89
Views: 14131

PostForum: Computer Chess Club: Programming and Technical Discussions   Posted: Thu Jun 20, 2013 6:10 pm   Subject: Re: First post (and FailHigh question!)
Hello Thomas,

I've read Bob's description in crafty how he does it (If I remember right it was storing the distance to the start of the current search).

At the time I did not understand how this ...
  Topic: First post (and FailHigh question!)
Chan Rasjid

Replies: 89
Views: 14131

PostForum: Computer Chess Club: Programming and Technical Discussions   Posted: Thu Jun 20, 2013 5:10 pm   Subject: Re: First post (and FailHigh question!)
Hello Sven,

The unrestricted magnification of search mate scores happens and I think it is not a bug.
I'm tired to repeat the same over and over again. If you like you may choose to reread what I ...
  Topic: First post (and FailHigh question!)
Chan Rasjid

Replies: 89
Views: 14131

PostForum: Computer Chess Club: Programming and Technical Discussions   Posted: Thu Jun 20, 2013 4:01 pm   Subject: Re: First post (and FailHigh question!)

I handle the Mate scores in my TT rather straight forward. I dedicate a few bits in the hash entry to store the ply the score comes from. And if the score is probed from a different ply and it is a ...
  Topic: First post (and FailHigh question!)
Chan Rasjid

Replies: 89
Views: 14131

PostForum: Computer Chess Club: Programming and Technical Discussions   Posted: Thu Jun 20, 2013 3:40 pm   Subject: Re: First post (and FailHigh question!)
Hello Thomas,

So Natale's program behavior should not be a bug but rather is a case of search instability. The only difficulty is to explain when and why the mate score fail high stops as beta is p ...
 
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