Author: Christophe Theron
Date: 22:43:57 03/29/01
Go up one level in this thread
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
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