Author: Laurence Chen
Date: 05:08:12 03/10/00
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On March 10, 2000 at 06:43:06, Inmann Werner wrote: >Yesterday, I absolutly was unhappy about the evaluation function of my engine, >so I trashed it and left only the material balance. >(I found some serious bug in evaluation which, when corrected had no effect in >my testsuites..) >For fun, I started the LCTII Testsuite for Tactics and..... >I had an "all times best!!!!" >The engine solved all the same positions as with evaluation, but much quicker!! >The endgame positions did not work as good, cause a little knowledge about >passed pawns there is needed (although endgame Tablebases was used) but it >scored about 50% as if with evaluation. > >Till now, I much tested with tactical positions..... >Conclusion for me: >If I improve my search algo, I still will use the tactiacl positions. But if I >put some knowledge in, I only will look, if the knowledge disturbs the tactical >search. > >What I need now: >Positions for computers, where you can test knowledge. No very hard positions, >but clear!! and simple!! positional things, which never can be found tactical. >1) king safety and threat out of horizon.(>ply 18) >2) rook on free lines.. >etc etc (I am too poor in chess, to tell you the rest...) > >The goal: If I put in knowledge, and the tactics do not suffer too much, but the >positional positions are found quicker, the engine is better. >For each problem should be some different positions, cause it is very simple to >tune a engine for one position with "knowledge", which is bad for the same >problem in other positions. > > >I know, the end test will be games, but ....... > >In many suites, there are a lot of sacrifice positions. I do not like them very >much. The best solver for it is my "without knowledge" engine, if it finds the >payback. It do not like the idea to accept sacrifice for some positional >advantage, the program not really understands and can push.... > >Werner To start you could search for test positions games which involves quiet moves in Botvinnik, Petrosian and Karpov games. Especially Petrosian and Karpov, these two are virtuoso in quiet moves. I believe that such positions would involve prophylaxis knowledge, and I would search for games which have this type of move. Good luck. Laurence
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