Author: Len Eisner
Date: 09:32:23 01/15/00
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 > > 8/8/2k1B3/1p5q/3Q4/1KP5/8/8 w - - 0 84 > > >>Len That is impressive. Junior 6 is a great program. I got it a few days ago, and my first impression is that it plays the most human-like game of all the programs available today, including Hiarcs. I completely agree with your assessment of it. I know the unusual move in game 4 (Rd3+) was generated by the tablebases, not Junior 6. If the Turbo CD had a complete set of five piece tablebases, Junior would have played g4 instantaneously. I also understand why Chessbase did not include the KBRP vs. K tablebase. It is an easy win for the stronger side, so why dedicate a few hundred Meg of hard drive space to it. The downside is that you will sometimes see strange moves like Rd3+. A human master would have resigned long before the position was reached anyway. Len
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