Author: Robert Hyatt
Date: 11:21:14 03/29/01
Go up one level in this thread
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.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.