Author: Kurt Utzinger
Date: 00:41:01 08/10/03
Go up one level in this thread
On August 10, 2003 at 02:24:47, Uri Blass wrote:
>On August 09, 2003 at 19:11:16, Harald Faber wrote:
>
>>On August 09, 2003 at 05:55:43, Tony Hedlund wrote:
>>
>>>How can J8 allow game 14 to end as a draw?
>>
>>
>>This is no serious question, isn't it?
>>It has been posted and mentioned approx. 1,000,000 times. It is the problem of
>>incomplete tablebases. AFAIK you/SSDF uses the "Fritz Endgame Turbo". Based on
>>the Chessbase marketing it consists of 4 CD-roms with "the most important
>>endgame tablebases". Based on what you saw in this game, what many many others -
>>include me - have seen in similar positions, it is crap.
>>Let me ask you a question. If your answer is yes, do I win a price?
>>Here is the US-$1,000,000 question:
>>Are you missing at least one of these files in your tablebase-directory?
>>
>>kqbkp.nbb.emd
>>kqbkp.nbw.emd
>>kqbkn.nbb.emd
>>kqbkn.nbw.emd
>>kqbkb.nbb.emd
>>kqbkb.nbw.emd
>>kqbkr.nbb.emd
>>kqbkr.nbw.emd
>>kqbkq.nbb.emd
>>kqbkq.nbw.emd
>>
>>
>>If you had them all(!), Junior 8 would have mated.
>
>Did you look at the game?
>
>Junior8 blundered in a position when there were 6 pieces in the board
>and there was no winning capture that leads directly to tablebase position
>(the only possible capture in the game QxP could lead to a draw and Junior8 did
>not draw because of playing it)
>
>Here is the final position
>
>[D]2Q5/1K4p1/4pk2/8/8/8/7B/8 w - - 0 92
>
>Are you sure that the problem is a tablebases problem?
>
>I think that the problem is the engine and I also do not agree that the ssdf has
>to give the engines all the tablebases because a good engine should know to play
>with part of the tablebases.
>
>Uri
Hi Uri
It's indeed a tablebase and not an engine problem. In the following
position, Junior8 with all 3-/4-/5-men EGTB shows:
[D]5Q2/1K4p1/4p1k1/8/8/8/7B/8 w - - 0 1
Junior 8 A1200 - Junior 7 A1200
5Q2/1K4p1/4p1k1/8/8/8/7B/8 w - - 0 1
Analysis by Junior 8:
89.Dxg7+ Kxg7 90.Lb8
= (0.00) Tiefe: 3 00:00:00
89.Da3 Kf5
+- (14.14) Tiefe: 3 00:00:00
89.Db4 Kf5
+- (14.26) Tiefe: 3 00:00:00
89.Dc5 Kf6
+- (14.48) Tiefe: 3 00:00:00
89.Dd6 Kf7 90.Le5
+- (15.16) Tiefe: 3 00:00:00
89.De7 Kf5
+- (#8) Tiefe: 3 00:00:00
+- (#8) Tiefe: 3 00:00:00
(Utzinger, MyTown 10.08.2003)
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