Author: Steven Edwards
Date: 15:14:04 04/16/04
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On April 13, 2004 at 21:20:31, Roger D Davis wrote: >On April 13, 2004 at 16:58:01, Steven Edwards wrote: >>Symbolic: Status report 2004.04.13 >> >>Not much has happened is the past two weeks mostly because of health >>difficulties. But I have added a couple new bootstrap recognizers including >>pin/frozen/restricted reporting. I'm also working on a more structured approach >>to organizing the pattern instance databases. I hope to have more in another >>week. >Keep going, Steven. Never give up. I don't purport to understand the nuts and >bolts of what you're doing, but I do understand the significance, and there are >those of us who are watching every move forward and cheering for you. :) Thanks for the encouragement. I've gotten the new, and I hope final, version of the instance database implemented. "And although there are many, many arrays in the underlying toolkit, Symbolic's Lisp code has only one array so far: an instance DB. (I'm not counting bitboards here.) I've decided to use an array of lists because of the heavy frequency of access of the instances and the need to restrict matching attempts to only those existing instances that might be applicable. Each node symbol in the search tree has an InstanceDB property that gets initialized with the instance DB for the position value of the node when the node is expanded. Only the sixteen (so far) bootstrap patterns are tried by default for each node. As expected, the pattern matching (instance generation) has turned out to be fairly computationally intensive and so I'm working on developing gateway patterns that selectively guide future matching efforts. Part of my plan at this point is to go through a lot of the BWTC positions using solution PVs from the toolkit and developing patterns that can be used to make winning plans. I believe I can concentrate on doing king hunt planning now without losing much generality.
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