Author: Heiner Marxen
Date: 08:04:26 10/09/01
Go up one level in this thread
On October 08, 2001 at 18:43:14, leonid wrote: >On October 07, 2001 at 13:46:06, Heiner Marxen wrote: > >>On September 30, 2001 at 05:43:43, Tim Foden wrote: >> >>>On September 29, 2001 at 07:33:59, leonid wrote: >>> >>>>Hello! >>>> >>>>This mate is probably very easy. There are good chance that you will solve it >>>>even by brute force wihtout too much waiting. >>> >>>As other post pointed out, I'm afraid this one isn't as easy as you thought :) >> >>Yes. Chest agrees with you :-) >> >> >>>>[D]RQ2rqbb/4p2k/1KQQqQ1n/1R2qqpq/1P3P2/1BBPNN2/nq6/rq4QQ w - - >>>> >>>>Please indicate your result. >>> >>>GLC215-pr9, 920MHz Duron, 96MB hash claims Nxg5+ is a mate in 11, after 10m 3s. >>> >>>Cheers, Tim. >> >>Chest on K7/600 with 350 MB hash needs 3.6 days (!) to be sure about it. >>1.Nxg5+ is the only key move for mate in 11. Interestingly, Chest gives >>the exact same PV as GLC below. >>To prove that there is no mate in 10 Chest needs more than 12 hours, already. >> >>I wonder how Leonid did this one with "brute force search". Leonid? > > >Hi, Heiner! > >I went on this position only 10 moves deep. Since mine found mate in 11, I was >sure that it is mate in 11. Probably will put this position by brute force at >night 11 moves deep. > >I expected that some programs with more hash and quiker computer will solve more >rapidly that mine. This situation I was able to see repeatedly with your >program. Sometime I feel that I must to come back to my code and do something. > >Brute force search: > >Depth (moves) Time Branching factor nodes/second > >4 moves 0.93 sec 77k (killo nodes/one sec) > 4.0 >5 moves 3.73 sec 72k > 3.94 >6 moves 14.72 sec 59k > 4.29 >7 moves 63 sec 65k > 4.06 >8 moves 4 min 16 sec 74k > 5.8 >9 moves 24 min 54 sec 78k > 5.5 >10 moves 2 h 18 min 27 sec 88k > >Celeron 600Mhz. > >Enjoyed very much your program!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! > >Really very, very impressive! Thanks for your kind words! The above times for your program clearly indicate that Chest can be improved. This time you are 5 times as fast as Chest! Will have to study that problem later. Cheers, Heiner
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