Author: leonid
Date: 08:31:35 02/08/01
Go up one level in this thread
On February 08, 2001 at 10:45:07, Heiner Marxen wrote: >On February 08, 2001 at 10:09:29, leonid wrote: > >>On February 08, 2001 at 09:49:16, Pete Galati wrote: >> >>>On February 08, 2001 at 08:21:44, leonid wrote: >>> >>>>Hi! >>>> >>>>If you like to solve easy (not deep) forced mate position, here is the one. >>>> >>>>[D]Nb1rkrNb/1n1pqp1b/n2qqq1n/1NNNNNNn/2BNNB2/1R2Q1R1/8/2K5 w - - >>>> >>>>Please, indicate your result. >>>> >>>>Thanks, >>>>Leonid. >>> >>>Crafty found the mate in 8 a little bit earlier but it had it's hashtables all >>>filled up, and I can't operate it at up to 96mb hashtables on my computer, so >>>I'm stuck with 48 at the moment. I never get around to mentioning, it's a >>>700mhz Celeron. >>> >>>Pete >>> >>>5 piece tablebase files found >>>1836kb of RAM used for TB indices and decompression tables >>>EGTB cache memory = 3M bytes. >>>hash table memory = 48M bytes. >>>pawn hash table memory = 5M bytes. >> >>Simply can't detain my curiosity, what is the "pawn hash table"? Special hash >>table just for pawns? > >Yes, for that part of the eval which is based only on the location of >all the pawns (pawn structure). > > >>Thanks for detailed decription! Sometime, some very interesting moments come to >>light. >> >>My program found at the same depth mate but I not looked by brute force. It >>could be that somebody will come with shorter mate. >> >>Leonid. > >I doubt it. Chest says "no mate in 7" after 68.4 minutes. >You all found the shortest mate: Congratulations! Thanks, but I doubt very much that my program will search 7 moves in one hour. It had awful branching factor and in 5 moves already went to 10 min. Selective search make me feel this by solving position by easiest level (8 moves deep)in 18 sec. Usually it should be only split of one second for 8 moves, for that search level. Brute force search: 3 moves - 0.38 sec 4 moves - 22.3 sec 5 moves - 9 min 52 sec Leonid. >Heiner
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