Author: Robert Hyatt
Date: 08:31:01 12/13/00
Go up one level in this thread
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.
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