Author: leonid
Date: 08:15:05 09/06/00
Go up one level in this thread
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. > >Extracted bm= > >00:00:00.031 2 - -3000 Bxb8 Kxb8 ? ? ? ? ? ? ? ? ? ? >00:00:00.046 2 - 5000 e8 Rd1 ? ? ? ? ? ? ? ? ? ? >00:00:00.046 2 - 5000 e8 <---------- > >00:00:00.109 3 - 8000 Bxb8 Rd1 e8 Kc7 Qxd8 ? cxd7 Kc7 Qg8 >? ? ? ? >00:00:00.109 3 - 8000 Bxb8 <---------- > >00:00:00.171 4 - -1000 Bxb8 Re3 e8 Rxe8 Bxe5 ? Qf5 Rxb3 Qxd3 >Kxc6 ? ? ? ? >00:00:00.187 4 - 5000 e8 Rb3 Bxb8 Rxb8 Qxc6 Kxb8 Qb7 ? Qa7 >? ? ? ? ? >00:00:00.203 4 - 5000 e8 <---------- > >00:00:00.312 5 - 2000 Bxb8 Re3 Bd6 Re6 e8 Rxe8 e8 Rxe8 Kb4 >Rxc7 Nxc3 ? ? >? ? >00:00:00.406 5 - 77777771 e8 Rb3 c7 Rb6 Bxb6 ? Qxb3 Rxb7 e8 >Kd7 Qxd6 ? ? >? ? >00:00:00.437 5 - 77777771 e8 <---------- > >00:00:00.531 6 - 0 Bxb8 Re3 Kxa5 Kxb8 c7 Kc8 e8 Rxe8 e8 >Rxc8 axb5 ? ? >? ? ? >00:00:00.750 6 - 77777771 e8 Rb3 c7 Rb6 Bxb6 ? Qxb8 ? axb5 ? >Bxg3 ? ? ? ? >? >00:00:00.812 6 - 77777771 e8 <---------- > >00:00:01.234 7 - 3000 Bxb8 Re3 Bd6 Re6 Kxa5 Re1 e8 Kxb8 cxd8 > ? Kb4 Kxc7 >Kxa6 ? ? ? ? >00:00:02.390 7 - 88879990 e8 Rb3 Qd7 Bc7 Qc8 Bb8 Qb7 Rxb7 cxb7 > ? ? Rxa4 Qb7 >? ? ? ? >00:00:02.531 7 - 88879990 e8 <---------- > > >Elapsed Time= 2.53 seconds Excellent time! But on what computer and with what program you solved this position? What kind of search was executed? Selective or brute force? And in how many moves your program solved? I have the impression that in 7, but maybe it is my mistake. 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.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.