Author: Roy Eassa
Date: 14:45:03 09/27/01
Go up one level in this thread
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?
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