Author: Roy Eassa
Date: 09:50:36 05/21/02
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On May 20, 2002 at 21:02:12, Pham Minh Tri wrote: >>What are some other methods of pruning? > >The most famous, challenging and dangerous one is "filter": prune immediately >stupid moves. This method is used in ChessTiger. You can read more from Q&A with >Christophe: > >http://www.computerschach.de/sprechstunde/archiv/theron1e.htm That's a great interview! Thank you for posting the URL; I hadn't seen it before. Here's a GREAT quote from Christophe about improving your chess engine past the 2300 level: From now on, your judgment alone is not enough to decide when a change is really an improvement. If you rely only on your feelings, you are going to turn in circles. You will add something or change something, and you might eventually realize that this change has weakened your program. For you the time of the easy improvements is gone. Every additional ELO point from now on is going to be hard to earn. What you need now is a serious testing methodology. You need to define an accurate way to decide if a change has improved the playing strength of your program or not. Playing a few games manually will not do it. You probably need to write modules in your program dedicated to TESTING. For example a module that will eat a set of EPD position and try to solve them, and after the engine has crunched the positions you need to be able to output some kind of statistics, and you must be able to compare the output with the output of your current reference version. Maybe you need to study a little bit of statistics (if you do not have the required background already) to understand about things like margin of errors in random events. Maybe you need to implement Auto232 in your program, so you can get a large number of automatic results. But from now on you will not make any significant progress without a serious TESTING METHODOLOGY. So I would advice you to invest a lot of time in finding and refining yours. A lot of time means several days, probably several weeks.
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