Author: Uri Blass
Date: 15:03:43 09/27/01
Go up one level in this thread
On September 27, 2001 at 17:45:03, Roy Eassa wrote: >On September 27, 2001 at 15:53:35, Uri Blass wrote: > >>On September 27, 2001 at 15:23:07, Roy Eassa wrote: >> >>>On September 27, 2001 at 14:52:46, Uri Blass wrote: >>> >>>>On September 27, 2001 at 14:14:07, K. Burcham wrote: >>>> >>>>>takes shredder5 51 seconds to decide on Qh1. 1500 mhz amd >>>>> >>>>>Engine: Shredder 5 >>>>>by Stefan Meyer-Kahlen >>>>> >>>>> >>>>> 1.00 0:27 +9.84 1.dxe4 Rxd5 2.Rxg4 Bxc3 (5.687.141) 205.4 >>>>> 1.00 0:51 +M1++ 1.Qh1+ (10.192.541) 199.6 >>>>> 1.00 0:51 +M1 1.Qh1+ (10.192.542) 199.6 >>>>>best move: Qa1-h1 time: 0:51.058 min n/s: 199.642 nodes: 10.192.560 >>>>> >>>>>kburcham >>>> >>>>New position >>>>[D]8/8/pppppppK/NBBR1NRp/nbbrqnrP/PPPPPPPk/8/Q7 w - - 0 1 >>>> >>>>Analysis by Goliath Light 1.5: >>>> >>>>1.Qh1# >>>> +- (#101) Depth: 4/31 00:00:15 2874kN >>>>1.Qh1# >>>> +- (#1) Depth: 4/31 00:00:15 2874kN >>>> >>>>(Blass, Tel-aviv 27.09.2001) >>>> >>>>I do not understand the first mate in 101 score >>>> >>>>Deep Fritz's analysis after more than 10 minutes of search >>>> >>>>New position >>>>8/8/pppppppK/NBBR1NRp/nbbrqnrP/PPPPPPPk/8/Q7 w - - 0 1 >>>> >>>>Analysis by Deep Fritz: >>>> >>>>1.dxe4! >>>> +- (1.56) Depth: 1/2 00:00:00 >>>> >>> >>> >>>Is there a simple, understandable reason why several "strong" programs take so >>>long here? (Deep Fritz not seeing the mate in 1 after 10 minutes is >>>mind-boggling to me!) >> >>Yes >> >>Deep Fritz probably does a typical computer mistake >>of searching all the captures first. >> >>My guess is that one of the possible lines that >>Deep fritz searches is for example: >> >>1.dxe4 gxf5 2.Rxg4 fxg4 3.Bxd4 Bxa5 4.exf4 cxb5 5.Rxh5 Bxb3 >>6.fxg4 Kxg4 7.Bxf6 Kxg3 >> >>I guess that it is only one of the lines that Deep Fritz see >>before looking at Qh1# >> > > >I thought all programs searched everthing one ply first, then two ply, then >three, etc. If there's a MATE at one ply, then it would find it in a tiny >fraction of a second, no matter which order it chose to look at the moves, no? >Or is it doing extensions on other moves, even at ply 1? yes it does a lot of extensions in this kind of positions. it extend all the logical captures. usually the number of captures is not big so it can finish the job very fast but it is not the case in the relevant position. Uri
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