Author: Vasik Rajlich
Date: 00:53:10 12/29/03
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On December 28, 2003 at 23:31:21, Tom Likens wrote: >On December 28, 2003 at 20:54:36, Bob Durrett wrote: > >>Your bulletin is exciting since it shows there is still room for innovation in >>engine design. As you and others here develop and implement this idea the >>overall level of play of chess engines will go up simply because the >>front-runners will be forced to adopt some of your new ideas. I have often had >>the suspicion that "current wisdom" regarding searching, pruning, and the like >>is holding back the truly innovative people who might feel obligated to cling to >>the old ideas. I think the whole current theory about "extending and reducing" >>needs to be re-thought, although I am definitely no authority on that subject. >>The Earth is not flat after all! >> >>Perhaps the next extension of your idea is to perform and utilize complete >>dynamic position evaluations to refine the searching. >> >>Congratulations to you and the others for corageously pursuing a new idea which >>perhaps may go against "current wisdom." It is only through original innovation >>and invention that advances will be made. Old ideas are not always the best >>ideas. >> >>Bob D. > >Hello Bob, > >I think you might be underestimating the commercial engines. My suspicion >is that they have been using techniques similar to this for years. From my >short experience with the idea it's seems obvious that it has a tremendous >amount of potential but could be getting it right is tricky. My guess is >the commercial guys have struck the right balance and are reaping the >benefits. > >BTW, Tord Romstad deserves the credit for starting my neurons along these >paths. He's been doing this and more for quite awhile now in Gothmog and >has been more than willing to share his ideas with anyone that wanted to >discuss them. > >regards, >--tom I am quite sure that Shredder is doing some very speculative selective pruning & extending. It has very high search depths, especially selective search depths - (12/28) is not unusual in middlegame positions. Furthermore, its nps is not very high. This really hit me yesterday when I accidentally started Shredder instead of my program Rybka in the chessbase GUI and started to wonder why it was reporting such nice depths :-) Regards, Vas
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