Author: Borges
Date: 14:14:56 04/15/00
Go up one level in this thread
On April 15, 2000 at 16:18:04, Christophe Theron wrote:
>On April 15, 2000 at 15:56:18, Borges wrote:
>
>>On April 15, 2000 at 12:44:40, Christophe Theron wrote:
>> Hi Christophe!
>> I ran an account in ICC, and was able to get more than 3000 points, with no
>>special hardware. The interesting is that it rans with default settings. It
>>appers no coincidence that when i put NSEW=1 and MoreSel=1 tiger became weak
>>(IMHO). The hashtable I have to set up with 32M in 3 0 games and 64M in 5 0
>>games, less than this will result in odd endgames, when tiger sometimes put away
>>a victory.
>
>
>You should really check this carefully. Using 32Mb in 3 0 games kills the
>playing strength, I'm sure about this.
>
>
> Christophe
Actually I prefer to play with 3 0 time controls, I think that the best
evaluation of Chess Tiger makes the difference. It (or he) appears to smokes
everybody. The contempt value, that is useful, to clean a closed position set to
-15 or -20 is helpful. The only colateral effect of this is probably being
noplayed by crafty ;-) But a BOOK editor will make difference.
Congratulation for your program, probably better than you think (intended to
be a joke).
Borges
>> I shouldnt said that, perhaps i will lose some points :-). But with
>>this settings in icc chess tiger does very well! A book editor will help also.
>> Borges (not jorge luis)
>>
>>>On April 15, 2000 at 08:39:56, Laurence Chen wrote:
>>>
>>>>Hi all,
>>>> I've ran some blitz games between Junior6a and Rebel Tiger 12e, and Hiarcs
>>>>7.32 and Rebel Tiger 12e, and I was surprised the results. I'm using two
>>>>identical computers, Pentium III 600E, autoplayer 232, blitz games at 5 min. + 3
>>>>secs. Junior and Hiarcs were using Fritz 5.32 opening book, and Rebel Tiger its
>>>>default book with NSEW=1, MoreSel=1. In the match where all engines were using
>>>>16 MB of Ram for hashtables, Rebel Tiger got trounced very badly, against Junior
>>>>6a, it lost to a score of 15.5-34.5, against Hiarcs 7.32, it lost to a score of
>>>>13-37. Jim Walker suggested that I use 8 MB of RAM instead, so I ran another
>>>>match of Rebel Tiger against Hiarcs 7.32, both engines using 8 MB of RAM, and
>>>>now Rebel Tiger lost to a score of 21-29. I'm sure there are dupes, but that's
>>>>Rebel Tiger fault for having a bug in the learning book. Yes, I downloaded the
>>>>patch for learning from Rebel's website, and it did not fix the problem. This
>>>>clearly shows that giving more hashtable for Rebel Tiger in this time control is
>>>>very bad. The engine performance goes down a lot. So this raises the question,
>>>>what is the optimal hashtable for different engines at different time controls?
>>>>One cannot assume that 8 Mb of RAM for Hiarcs is better, I will later on run
>>>>another 50 games match with Hiarcs having 16 MB of RAM, and Rebel Tiger 8 MB of
>>>>RAM. A lot of us think that more RAM increases the strength of a chess engine.
>>>>From this little experiment, it clearly shows that the opposite is true. I
>>>>believe that there must be an optimal hashtable size where the engine will
>>>>perform its best when given the proper hashtable size for a specific time
>>>>control. How would one figure this out? I think that test suites cannot
>>>>provide a proper answer to this question, any ideas.
>>>>Laurence
>>>
>>>
>>>I have already answered this question several times, at least regarding
>>>Rebel-Tiger.
>>>
>>>At fast time controls, giving too much hash tables kills the program, because of
>>>the time needed to update them at the beginning of each search.
>>>
>>>If you give too much hash tables, Tiger will spend a significant amount of time
>>>before each move in order to update the informations stored in the hash table.
>>>Depending on the computer's speed, it can be 20% of the thinking time in the
>>>opening phase, to 80% of the thinking time in the endgame.
>>>
>>>In this case, the additional amount of hash table does not speed up the engine.
>>>It actually slows it down badly.
>>>
>>>In the next release of Rebel-Tiger, the engine will be equipped with an
>>>automatic hash table size setting algorithm, which will choose the best amount
>>>of hash table depending on the computer you are using and the time controls of
>>>the game.
>>>
>>>Until that, you might consider giving the engine less hash tables if you play at
>>>fast time controls in order to optimize its performances.
>>>
>>>
>>>
>>> Christophe
This page took 0.01 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.