Author: Christophe Theron
Date: 10:18:22 11/03/03
Go up one level in this thread
On November 02, 2003 at 23:51:34, Will Singleton wrote:
>On November 02, 2003 at 22:50:24, Christophe Theron wrote:
>
>>On November 02, 2003 at 17:12:38, Will Singleton wrote:
>>
>>>On November 02, 2003 at 16:52:49, Gerd Isenberg wrote:
>>>
>>>><snip>
>>>>>In the same vein, the following position has always been a nightmare for Tiger:
>>>>>
>>>>>[D]8/1KP5/3q2k1/8/6p1/8/8/8 b - -
>>>>>
>>>>>This position comes from a real game between the Modular Game System Sargon 2.5
>>>>>and Mike III, played in September 1980 during the Personal Computer World Fair.
>>>>>Mike III continued the game with a long series of checks leading to a draw.
>>>>>
>>>>>Chess Tiger is not smarter than Mike III here. It is something that I had fixed
>>>>>in the 16 bits version, to the expense of some added complexity in the passed
>>>>>pawns evaluation code. I have not transfered this code to the 32 bits version
>>>>>because it was not general enough (add another black pawn and the code did not
>>>>>work).
>>>>>
>>>>>I am interested in results of other (amateur and commercial) programs.
>>>>>
>>>>>
>>>>>
>>>>> Christophe
>>>>
>>>>Hi Christophe,
>>>>
>>>>IsiChess on AMD XP2.6+ first shuffles around with Qb4+, Qxc7 and Qd7.
>>>>After 5 seconds at depth 13 Qxc7 came up. Mate in 14 resp. 12 after one minute
>>>>and 1:10. I guess a matter of won KPK eval.
>>>>
>>>>Cheers,
>>>>Gerd
>>>
>>>Sure, but I'm not sure CT was referring to finding the mate as the problem. CT
>>>seems to have some problem understanding that KQK is better than KQKP, that's
>>>all I can figure.
>>>
>>>Will
>>
>>
>>
>>Does your program play this correctly in a very short time? Does it see an
>>endless sequence of checks with big score for white, or does it show the queen
>>capturing the pawn at some point in the main line?
>>
>>Without letting it think until it can actually see the repetition of course...
>>
>>
>>
>> Christophe
>
>It shows the capture, as far as I can tell. Note that Amateur always shows a
>promotion as a queen move, which is wrong, but what the hell.
>
>13891 >first : go
>14094 <first : 6 1573 17 53185 Qd7 Kb8 Qb5 Ka8 Qe8 Kb7 Qe7 Kb8
>14188 <first : 7 1564 23 82293 Qd7 Kb8 Qb5 Ka8 Qd5 Kb8 Qd6 Kc8 Qc6
>14641 <first : 8 1469 69 239057 Qd7 Kb8 g3 Qc8 Qxc8 Kxc8 g2 Kb7 Qg1 Kc6 Qe1
>14844 <first : 9 1471 90 316799 Qd7 Kb8 g3 Qc8 Qxc8 Kxc8 g2 Kb7 Qg1 Kc6 Kf5 Kd5
>Qd1 Kc4
>15047 <first : 10 1471 108 383464 Qd7 Kb8 g3 Qc8 Qxc8 Kxc8 g2 Kb7 Qg1 Kc6 Kf5
>Kd5 Qd1 Kc4
>15344 <first : 11 1473 139 514043 Qd7 Kb8 g3 Qc8 Qxc8 Kxc8 g2 Kb7 Qg1 Kc6 Kf5
>Kd5 Qd1 Kc4 Ke4
>16016 <first : 12 1473 207 785975 Qd7 Kb8 g3 Qc8 Qxc8 Kxc8 g2 Kb7 Qg1 Kc6 Kf5
>Kd5 Qd1 Kc4 Ke4 Kc3
>18375 <first : 13 1473 443 1716014 Qd7 Kb8 g3 Qc8 Qxc8 Kxc8 g2 Kc7
>25125 <first : 13 1475 1118 4647563 Qxc7 Kxc7 g3 Kc8 g2 Kc7 Qg1 Kd6 Qd4 Ke6 Kg5
>Kf7 Qd7 Kf8 Kf4 Kg8 Qd1
>27953 <first : 14 1475 1400 5817253 Qxc7 Kxc7 g3 Kd6
>32047 <first : 14 1476 1808 7560993 Qb4 Ka8 Qc4 Kb7 Kf5 Qc8 Qxc8 Kxc8
>35922 <first : 15 1476 2198 9252043 Qb4 Ka8 Qc4 Kb7 Kf5 Qc8 Qxc8 Kxc8
>82203 <first : 16 1476 6825 32304317 Qb4 Ka8 Qc4 Kb7 Kf5 Qc8 Qxc8 Kxc8 g3
Well that's excellent. I think I have no excuse and I will have to work on this
seriously...
I guess that there is no elo to gain from this change, but the program will
definitely look less stupid. And it also matters.
Christophe
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.