Author: Chessfun
Date: 11:41:58 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 ChessTiger 14.0 and Gambit 2.0 with all 3, 4 and 5 men bases call it mate in 34 instantly. Tablebases turned _OFF_ I waited till my Nodes were over 354603928 Gambit 2.0. Thunderbird @945 mhz with 96 mb hash. ; 00:00:00.1 2. Score: 0.00 depth: 13 Be5 Kg2 Ne7 h3 Ng6 h2 Bxh2 Kxh2 ; 00:00:00.8 2. Score: 0.11 depth: 14 Be5 h3 Kf2 h2 Kg3 Kg1 Bd4+ Kh1 Bf6 Kg1 Bd4+ ; 00:00:00.8 2. Score: 0.90 depth: 14 Bb8 ; 00:00:01.0 2. Score: 6.54 depth: 14 Bb8 Kg2 Ne7 h3 Bh2 Kf3 Nf5 Ke4 Nh4 Ke3 Bg3 Kd3 Kf2 Ke4 ; 00:00:03.6 2. Score: 7.44 depth: 15 Bb8 ; 00:00:04.3 2. Score: 7.88 depth: 15 Bb8 h3 Kf2 h2 Kg3 Kg1 Ba7+ Kh1 Nb6 Kg1 Nc4+ Kh1 Ne3 Kg1 Ng4+ Kh1 Bb8 Kg1 Nxh2 ; 00:00:06.4 2. Score: 7.88 depth: 16 Bb8 h3 Kf2 h2 Kg3 Kg1 Ba7+ Kh1 Nb6 Kg1 Nc4+ Kh1 Ne3 Kg1 Ng4+ Kh1 Bb8 Kg1 Nxh2 ; 00:00:09.4 2. Score: 8.32 depth: 17 Bb8 h3 Kf2 h2 Kg3 Kg1 Ba7+ Kh1 Nb6 Kg1 Nc4+ Kh1 Ne3 Kg1 Ng4+ Kh1 Bb8 Kg1 Nxh2 ; 00:00:10.4 2. Score: 8.32 depth: 18 Bb8 h3 Kf2 h2 Kg3 Kg1 Ba7+ Kh1 Nb6 Kg1 Nc4+ Kh1 Ne3 Kg1 Ng4+ Kh1 Bb8 Kg1 Nxh2 ; 00:00:14.9 2. Score: 8.48 depth: 19 Bb8 h3 Kf2 h2 Kg3 Kg1 Ba7+ Kh1 Nb6 Kg1 Nc4+ Kh1 Ne3 Kg1 Ng4+ Kh1 Bb8 Kg1 Nxh2 ; 00:00:21.1 2. Score: 8.60 depth: 20 Bb8 h3 Kf2 h2 Kg3 Kg1 Ba7+ Kh1 Nb6 Kg1 Nc4+ Kh1 Ne3 Kg1 Ng4+ Kh1 Bb8 Kg1 Nxh2 ; 00:05:45.0 2. Score: 8.72 depth: 21 Bb8 h3 Kf2 h2 Kg3 Kg1 Ba7+ Kh1 Nb6 Kg1 Nc4+ Kh1 Ne3 Kg1 Ng4+ Kf1 Nxh2+ Ke1 Bf2+ ; 00:05:56.2 2. Score: 8.72 depth: 22 Bb8 h3 Kf2 h2 Kg3 Kg1 Ba7+ Kh1 Nb6 Kg1 Nc4+ Kh1 Ne3 Kg1 Ng4+ Kf1 Nxh2+ Ke2 Ng4 ; 00:10:59.3 2. Score: 8.80 depth: 23 Bb8 h3 Kf2 h2 Kg3 Kg1 Ba7+ Kh1 Nb6 Kg1 Nc4+ Kh1 Ne3 Kg1 Ng4+ Kf1 Nxh2+ Ke2 Nf3 ; 00:12:27.3 2. Score: 8.80 depth: 24 Bb8 h3 Kf2 h2 Kg3 Kg1 Ba7+ Kh1 Nb6 Kg1 Nc4+ Kh1 Ne3 Kg1 Ng4+ Kf1 Nxh2+ Ke2 Nf3 ; 00:15:23.2 2. Score: 8.80 depth: 25 Bb8 h3 Kf2 h2 Kg3 Kg1 Ba7+ Kh1 Nb6 Kg1 Nc4+ Kh1 Ne3 Kg1 Ng4+ Kf1 Nxh2+ Ke2 Nf3 ; Analysis completed It could be your have odd tablebases, I have seen that type of behavior from most engines when they are missing a critical tablebase. Sarah.
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