Author: Uri Blass
Date: 00:19:53 03/30/01
Go up one level in this thread
On March 30, 2001 at 01:43:57, Christophe Theron wrote: >On March 29, 2001 at 14:21:14, Robert Hyatt wrote: > >>On March 29, 2001 at 14:08:06, Christophe Theron wrote: >> >>>On March 29, 2001 at 08:50:14, José Antônio Fabiano Mendes wrote: >>> >>>> An interesting miniature by a Russian composer(sorry,I can't remember >>>> his name) I came across the other day: >>>> [D]2N5/8/8/8/7p/8/7B/4K2k w >>>> The _only_ winning move is 1.Bb8!! [mate in 34] >>> >>> >>>Do I have a bug? >>> >>>Chess Tiger 14.0 and Gambit Tiger 2.0 both announce mate in 28 (that means they >>>think it is a mate in 29 starting from your position). >>> >>>The line is: >>> >>>00:32:36.2 Mate in 28 20 354603928 Bb8 Kg2 Ne7 h3 Bh2 Kf3 Ng6 Kg4 Kf2 Kf5 Nf4 >>>Ke4 Kg3 Kd4 Kxh3 >>> >>> >>>I do not have all the tablebases installed, and it is why Tiger needed half an >>>hour on my K6-2 450 to find the mate (24Mb hash). >>> >>> >>> Christophe >> >> >>Your PV is definitely wrong. The move Ng6 above is not optimal. Kd2 is mate in >>30, after Ng6 it is mate in 31. Kf2 after Kg4 is also non-optimal and takes you >>back to a mate in 31 for the 3rd time. After Kxh3 above it is a mate in 28 for >>white from that point forward. >> >> >> >>However, it is possible this is an artifact of not having the right databases. >>ie the P might turn into a knight in some variations and give check, rather than >>just into a Q which might be worse. >> >>with all 5 piece files I get mate in 34 as I posted in a different post. > > >OK, thanks. > >Indeed, I do not have all 5 men TBs installed. I have just installed the first >CD (1/2) of the Endgame Turbo product from ChessBase. > >Sarah has posted in another message that Tiger announces instantly a mate in 34 >with all TBs installed. No surprise as the root position has 5 pieces. :) > > > Christophe It is clear that there something is wrong here. There are two possibilities a)Tablebases are right and Tiger is wrong. b)Tiger is right and tablebases are wrong. I have nothing against Tiger but For some reason I guess that a is correct. Playing a game between Tiger as white and Tiger with all the relevant tablebases with black can give us more information. Uri
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