Author: Larry Griffiths
Date: 10:24:25 09/06/00
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On September 06, 2000 at 11:15:05, leonid wrote: >On September 06, 2000 at 08:46:01, Larry Griffiths wrote: > >>On September 06, 2000 at 07:34:48, leonid wrote: >> >>>Hello! >>> >>>Please, solve this position and say how much difference your hash table did. >>> >>>Indicate any parameter of your search that you consider important. >>> >>>It is pretty normal position from the book. >>> >>> kb6/B3P3/K1P5/p7/P7/3r4//8/8 w >> >>Here is what I got for this position... >> >>HashTable is 8 meg. >> > >Excellent time! But on what computer and with what program you solved this >position? What kind of search was executed? Selective or brute force? I ran this using my program on a Pentium III 550Mhz Xeon. I used a selective extension that continues deeper if the king in in check on the current ply or the previous ply. (It only finds forced mates this way). > >And in how many moves your program solved? I have the impression that in 7, but >maybe it is my mistake. > It looks like 9 PLYS to mate. I have not fixed my PV to work with extensions yet. I tried the other position but was not able to find a mate. I ran my program for 3 hours this morning. >Leonid. > > > >>> >>>My solver could not resolve it by selective search and went paintful 24 sec (AMD >>>400) before finding the mate. Mine have no hash tables. When I went to see it on >>>Rebel 10, I was impressed. His time in solving the position knew around 6 fold >>>improvement between solution without hash and with it. His hash was 28 M. >>> >>> q1bkb1q1/2nqn3/1BrnrB2/1R1Q1R2/1NNQNN2/2Q1Q3/2QQQ3/3K4 w >>> >>>This last, is the fantasy position. Did it yesterday. Also could not solve it at >>>minimum number of moves by selective search. It took lengthy 18.5 min to reach >>>minimum number of moves for mate by brute force. Selective search can reach it >>>only if one move more is permitted. Then it take it in 2 sec. But how much hash >>>table could help in this position? >>> >>>Thanks, >>>Leonid.
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