Author: Ed Schröder
Date: 07:51:51 05/29/00
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On May 29, 2000 at 02:17:28, Eelco de Groot wrote: >That looks very good, Ed! You sure seem to have improved the search! I would >love to have a new engine in ECTool. I hope there will be a discount for Rebel >owners? I suppose that would be Rebel for Windows then. I particularly like the >idea of ECTool as a sort of an alternative interface for Rebel, if it can also >use bookopenings and personalities. The Century 2.0 engine is a between version and will be only for ECTOOL and EPD2DIAG as it became time people are offered an update. Upgrading from Rebel10 is possible. >I am almost positive that if in the new search you see more tactics that also >means that there are some pruning differences now. And in that case I would >think that that also means that you had to do some retuning. Looking at the >different lines played by the new engine it seems to be playing rather >differently, too? If you could maybe say something about that Ed? It would be >much appreciated! The last 2-3 years I mainly worked to tune Rebel's evaluation function, the thing I like to do most. It has been a good thing to do that and the results against strong humans (GM challenge, Israel League) has proven that. Because of all the work on eval I have neglected search the last 2-3 years. Not that that matters much against humans but I noticed in comp-comp you can not neglect search for such a long time without consequences. I had a good look at my direct comp-comp competitors and found out 2 things: a) an enormous jump in playing strength last year (which was noticed by only a few people here!) and b) that (a) was mainly caused by improving search. As a result Rebel Century 1.2 was born (which is about search only) and after Century 1.2 I obliged myself to work for one full year on search only as I noticed there is still a lot to gain in this area, much more than I ever imagined. So that's the story for new upcoming versions, the emphasis will be on search resulting in deeper search depths. The fact that you see different moves and scores is also search related, if the quality of selective search improves (other) better moves will be the result. Ed >I'm looking forward to Century 2! > >Eelco
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