Author: Larry Griffiths
Date: 12:27:25 08/13/00
Go up one level in this thread
On August 10, 2000 at 19:08:18, Colin Frayn wrote:
>On August 10, 2000 at 16:17:47, Christoph Fieberg wrote:
>
>>Unbelievable, but true:
>>I composed a position which is mate in 1 and can easily found, but Fritz6 on
>>Pentium III, 500 Mhz and 32 MB Hash needs more than 1 hour to show it (excatly
>>1:03:17)!!!
>>How do other computers react?
>>
>>The position is
>>FEN: 8/8/pppppppK/NBBR1NRp/nbbrqnrP/PPPPPPPk/8/Q7 w - - 0 1
>
>You're seriously telling me that top quality programs have to think about a mate
>in 1? Now either there's something wrong with the setup, or a bug in the
>program, or simply that's just bad programming. I don't see how a simple
>iterative deepening loop could ever miss a mate in one, regardless of null moves
>or extensions or otherwise.
>
>ColChess finds this mate in a total of 42 nodes, none of which it searches for
>more than a preliminary ordering evaluation. This all takes significantly under
>a milisecond. Have I missed some subtlety here?
>
>Cheers,
>Col
Thanks to whoever originally posted this position. I found a bug in my EPD
string code. I do not have iterative deeping yet, but can find it quickly going
4 plys deep. I am working on my checkmate/stalemate code now :)
TCBoard - RunMinMax()
(19-28) Alpha= 3999
(21-28) Alpha= 3999
(35-27) Alpha= 3999
(20-27) Alpha= 3999
(37-27) Alpha= 4001
(34-27) Alpha= 4001
(21-30) Alpha= 4001
(38-30) Alpha= 4001
(18-27) Alpha= 4001
(17-26) Alpha= 4001
(20-29) Alpha= 4001
(16-25) Alpha= 4001
(17-24) Alpha= 4001
(18-25) Alpha= 4001
(32-26) Alpha= 4001
(19-26) Alpha= 4001
(33-24) Alpha= 4001
(33-26) Alpha= 4001
(22-29) Alpha= 4001
(34-25) Alpha= 4001
(33-42) Alpha= 4001
(33-40) Alpha= 4001
(34-41) Alpha= 4001
(34-43) Alpha= 4001
(32-42) Alpha= 4001
(35-43) Alpha= 4001
(47-46) Alpha= 4001
(37-43) Alpha= 4001
(47-39) Alpha= 4001
(38-39) Alpha= 4001
(38-46) Alpha= 4001
(47-54) Alpha= 4001
(47-55) Alpha= 4001
(32-49) Alpha= 4001
(35-36) Alpha= 4001
(37-52) Alpha= 4001
(37-54) Alpha= 4001
( 0- 1) Alpha= 4001
( 0- 2) Alpha= 4001
( 0- 3) Alpha= 4001
( 0- 4) Alpha= 4001
( 0- 5) Alpha= 4001
( 0- 6) Alpha= 4001
( 0- 7) Alpha= 88888891
( 0- 8) Alpha= 88888891
( 0- 9) Alpha= 88888891
Elapsed Time= 0.02 seconds
Ply ---CAPTURES-- -----MOVES----- -----TOTAL----- BF
1 29 15 44 3
2 115 23 138 14
3 1,246 794 2,040 2
4 4,270 1,523 5,793 0
_____________ _______________ _______________
5,660 2,355 8,015
Captures/Moves Per Second= 500,938
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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