Author: chandler yergin
Date: 19:33:09 10/18/05
Go up one level in this thread
On October 18, 2005 at 22:25:20, chandler yergin wrote:
>On October 17, 2005 at 14:40:52, Uri Blass wrote:
>
>>On October 17, 2005 at 08:42:12, Mike Hood wrote:
>>
>>>On October 17, 2005 at 08:03:49, Vladimir Medvedev wrote:
>>>
>>>>
>>>>>I was thinking why not have an algorithim that can recognize certain aspects of
>>>>>the position and then accordingly change parameters "on the fly". For example
>>>>>in the opening it would use certain parameters, then when the position becomes
>>>>>dynamic again a change in parameters, if both bishops are on again another
>>>>>parameter.
>>>>
>>>>A brilliant idea: when position is good algorithm should evaluate it as good,
>>>>and when position is bad, it should be evaluated as bad. I wonder why no chess
>>>>programmer implemented this simple approach during 40+ years of chess
>>>>programming...
>>>
>>>The problem with this approach is: apart from very general classifications
>>>("opening", "middlegame", "endgame") it would be necessary to build the position
>>>recognition and parameter alteration into the algorithm in order to analyse a
>>>position. And if a position is recognized, why not just add a positional offset
>>>point or two to the evaluation rather than alter the parameters? Even obvious
>>>positional criteria such as passed pawns aren't as clear cut for parameter
>>>changes. There may be a passed pawn on the board now, but it could be gone after
>>>6 plies into the search.
>>>
>>>I'm not saying that the dynamic parameter approach is impossible to implement.
>>>All I'm saying is that this approach would probably lead to an overall weaker
>>>engine.
>>
>>
>>I think that it is possible to use this approach in opening book.
>>
>>opening book today include only moves.
>>
>>I think that it may be better to include after every move recommended
>>personality to use in case that the opponent get you out of book.
>>
>>The main problem with this approach is that you may need a lot of testing to do.
>>
>>You may find that personality X does the engine 50 elo better in lines that are
>>A54 based on the ECO but you may need months of testing by a tester in order to
>>get the details of personality X .
>>
>>I think that in order to succeed with this approach you may need hundrends of
>>testers when everyone of them will investigate different ECO line and no
>>programmer have today hundreds of testers to help him to improve his program.
>>
>>Uri
> Make your own Opening book! You simply import games from a large Database
>into your Engine Opening book, truncating them 20 moves beyond the ECO
>Classification. You can make it as large as you want. The .ctg of course must be
>your 'Write Data base' or 'reference' database. It is not a problem.
>To be up to date on Theory, download games every weeek from TWIC.
>Drag & Drop into the reference .ctg file.
Another suggestion Uri, Simply do a search of your large .pgn Database
for ELO'S over 2600. Highlight the games and copy them into a new file
called for Example: Power.ctg
Then Select your engine, and load this, making it the active Opening book.
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