Author: James T. Walker
Date: 05:26:29 01/16/00
Go up one level in this thread
On January 15, 2000 at 11:56:52, Enrique Irazoqui wrote: >On January 15, 2000 at 11:14:16, Len Eisner wrote: > >>On January 15, 2000 at 05:24:07, Enrique Irazoqui wrote: >> >>>On January 15, 2000 at 05:19:40, Bertil Eklund wrote: >>> >>>>On January 15, 2000 at 01:19:48, Len Eisner wrote: >>>> >>>>>In the following position Junior 6 plays 88…Rd3+ which wins (mate in 15), but >>>>>the simple g4 wins much faster (mate in 8). Why do the tablebases prevent >>>>>Junior from finding the fastest mate? >>>>> >>>>> >>>>>Len >>>> >>>>Hi! >>>> >>>>I think Enrique didn´t have the Turbo-CD´s in the beginning of the tournament. >>>>As far as I know, he have installed them now, >>> >>>You are right. >>> >>>Enrique >>> >>>>so Junior finds it now. >>>> >>>>Bertil >> >>Actually, the 5 piece endgame in question (KRB vs KP) is not included on the >>Turbo-CD´s. My guess is that Junior plays Rd3+ because it wants to simplify >>into a position contained in one of the 4 piece tablebases (KB vs KP), even if >>it is a much longer mate. >> >>You have to admit, Rd3+ looks bizarre when the simple g4 is available. What >>human master would play Rd3+? > >I guess none, but then again computer programs and GMs don't follow the same >thinking or computing process. Would a GM in the position below play 84.Kb4 and >announce mate in 19? Sure not, and Junior 6 did in the 13th game against >Shredder 4... > >Enrique > >[D] 8/8/2k1B3/1p5q/3Q4/1KP5/8/8 w - - 0 84 > > >>Len I see no reason why a GM would not play Kb4 in the position. As far as announcing mate in 19 they usually don't do that since it is considered bad manners by most. Tablebases cause some very strange moves by computers. Quite often they avoid capturing a piece or pawn because that would put them in a tablebase draw, so they try to continue playing in very simple drawn positions. I would like to see this cleaned up by the programmers but I guess they have more important stuff to work on. Jim Walker
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