Author: Bertil Eklund
Date: 14:06:41 03/06/02
Go up one level in this thread
On March 06, 2002 at 16:49:55, Thorsten Czub wrote:
>On March 06, 2002 at 16:11:04, Rich Van Gaasbeck wrote:
>
>>I dusted off my old Chess Challenger 7 last night and played a game. Granted it
>>was set at level 1, but I can't figure out why it would play 14...Qb6. All it
>>had to do was move its queen to d7 or e8. Wouldn't even a 1978 computer do a
>>full 4 ply search? Did the CC7 use selective searching at the root?
>>
>>[Event "?"]
>>[Site "?"]
>>[Date "2002.03.05"]
>>[Round "?"]
>>[White "Van Gaasbeck, Rich"]
>>[Black "Chess Challenger 7, level 1"]
>>[Result "1-0"]
>>[ECO "C44"]
>>[WhiteElo "1275"]
>>[BlackElo "1100"]
>>[Annotator "Van Gaasbeck,Rich"]
>>[PlyCount "55"]
>>
>>{96MB, VANGAASBECKRI} 1. e4 e5 2. Nf3 Nc6 3. d4 Qf6 4. c3 Be7 5. Bg5 Qd6 6. d5
>>Bxg5 7. Nxg5 Nce7 8. Be2 Nf6 9. Qc2 O-O 10. Nd2 Qc5 11. O-O d6 12. b4 Qb6 13.
>>Nc4 Qb5 14. Nb2 Qb6 15. Na4 Bg4 16. Nxb6 axb6 17. Bxg4 Nxg4 18. f3 Ne3 19. Qb3
>>Nxf1 20. Kxf1 Rfd8 21. a4 c5 22. a5 b5 23. bxc5 dxc5 24. Qxb5 Ra6 25. Qxb7 Rdd6
>>26. Qb8+ Nc8 27. Qxc8+ Rd8 28. Qxd8# 1-0
>
>challenger 7 had, as far as i remember, no check if you move is legal.
Hi!
As far as I remember it wasn't possible to play illegal moves.
Christophe is right that C7 searched about 2 selective plys in level1.
Meaning it sometimes missed mate in 1.
Sometimes I still play with it and mostly I can mate it between 12 and 15 moves
on level2.
>
>in fact you could have played illegal moves such as queen d1-f7 mate
>if f7 would have been protected by another piece.
>
>also there was a very short mate possible against this machine.
>i think with legal play arround < mate in 10 from opening.
>
>the spracklen program at this early stage had, as far as i remember
>it, no iterative search.
The program wasn't written by the Spracklens, someone else maybee remember who
was the programmer.
They began with Sargon1 for TRS-80.
>
>the search went from ply 1 to 2 to 3 to 4 to 5.
>
>todays chess program make a one ply search, than they make a 2 ply search.
>than they make a 3 ply search. as far as i know.
>
>the best thing is the display that it computes.
It was able to solve most but not all mate in 2 and a few mate in 3!
Bertil
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