Author: Ed Schröder
Date: 09:17:20 12/13/00
Go up one level in this thread
On December 13, 2000 at 11:31:01, Robert Hyatt wrote: >On December 13, 2000 at 06:16:54, Uri Blass wrote: > >>On December 13, 2000 at 05:41:34, Günther Simon wrote: >> >>>On December 13, 2000 at 02:17:16, Uri Blass wrote: >>> >>>>On December 13, 2000 at 01:33:25, Jouni Uski wrote: >>>> >>>>>Oh not again!! This trojanishe Esel (g5 sacrifice). >>>>> >>>>>Jouni >>>> >>>>I think that avoiding hxg5 is a good test position for chess programs. >>>> >>>>I am surprised that shredder falled into this trap in tournament time control >>>>because I know that one of the things that was improved in shredder5 relatively >>>>to shredder4 is tactics. >>>> >>>>I believe that other chess programs may do better. >>>> >>>>Junior6 probably can avoid hxg5 on the same hardware at tournament time >>>>control(I say probably because I have not Junior6 and I only checked that >>>>Junior5.9 can see 0.00 evaluation for hxg5 at depth 17 and later changes its >>>>mind to dxc4) >>>> >>>>Uri >>> >>>As far as I know some progs now have implemented an Anti-Trojan function. >>>One of them must be Crafty. I am just wondering why it is not implemented >>>in all newer chess software?! >>> >>>Günther >> >>I know that the anti trojan function is not used by crafty against copmputers. >> >>The antitrojan function can cause problems if the program will be afraid to take >>g5 when it is good to do it so I dislike it. >> >>I prefer to see anti-trojan extensions when the computer discovers trojan >>situation(positions when hxg5 hxg5 is possible at the root) >> >>It means that if hxg5 hxg5 is possible(I assume the side who sacrifice is white >>without loss of generalization) then the program will consider the typical >>trojan attack moves as 0 plies in the search. >> >>Usually taking the piece at g5 is the tactical mistake so doing the extensions >>only when hxg5 hxg5 is possible at the root can solve the practical problem >>without doing the program slower in most of the cases. >> >>Uri > > >The trojan horse detection is now automatic in crafty. If it sees the key >elements of the trap, at the root position, then it will enable the anti- >trojan code and in the game given, it will _never_ consider hxg. If one or >more key elements are missing, then it will rip it given the chance, because >it will be safe. As you see Uri "sometimes" pre-processing can be very useful. Ed
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