Author: Uri Blass
Date: 11:57:07 11/17/05
Go up one level in this thread
On November 17, 2005 at 14:27:48, Dieter Buerssner wrote:
>On November 17, 2005 at 10:13:27, Uri Blass wrote:
>
>>The original position is mate in 36 based on backward analysis by yace
>
>You might be interested to know how to find the mate score in such a position
>with Yace even without TBs. Set Endgame Database usage to high (or when using
>console mode, tb_u 4). With your computer, it should take less than 3 minutes,
>to show a mate in 36 (in console mode even with a PV until the end).
>
>1.Ke4 Ke8 2.Ke3 Kd7 3.Kd3 Kc8 4.Kc4 Kd8 5.Kd4
>Ke8 6.Kc5 Kd7 7.Kd5 Ke7 8.Kc6 Kf6 9.Kd6 Kf7
>10.Kd7 Kf8 11.Ke6 Ke8 12.f6 g6 13.f7+ Kf8
>14.Kd6 Kxf7 15.Kd7 Kf8 16.Ke6 Kg7 17.Ke7 Kh7H
>18.Kf7H Kh6H 19.Kf6H Kh7H 20.Kxg5H {EGTB}
>20...Kg7! 21.h4! Kh7 22.Kf6! Kh6! 23.g5+! Kh5!
>24.Kf7 Kxh4 25.Kxg6!! Kg4 26.Kf6! Kh4 27.g6!
>Kg4 28.g7 Kf4 29.g8=Q! Ke4 30.Qd8 Ke3 31.Kf5
>Kf2! 32.Qd3 Kg2 33.Qe2+ Kg3 34.Kg5! Kh3 35.Kf4!
>Kh4 36.Qh2# {1001}
>
>Yace thinks, that Kd4 is also a mate in 36, Kd5 mate in 37 and the pawn moves
>are draw.
>
>BTW. I am not sure, if Yace was here just lucky. (José Raul Capablanca, "A good
>player is always lucky." :-)
>
>Regards,
>Dieter
Fruit is a better player than yace and cannot find the mate even with tablebases
so the question is how Capablanca can explain Fruit's failure:-)
Of course I know that yace is good in this type of positions and hopefullty some
improvement in fruit's hash may help it to solve the position(I even did not try
them with Movei because when hash is not used for pruning I do not believe that
it has chances to solve it inspite of the fact that Movei seems to be at
similiar strength to Yace and scored half point more than yace in the following
tournament http://www.husvankempen.de/nunn/tabellen/promo.htm).
Uri
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.