Search found 17077 matches

by bob
Wed Jul 11, 2007 5:41 pm
Forum: Computer Chess Club: General Topics
Topic: Sensational! Y.Ossipov talking about STRELKA
Replies: 59
Views: 40572

Re: Sensational! Y.Ossipov talking about STRELKA

I suppose it all depends on how the program was structured. Tord went from mailbox to bitboard yet all the specifics are well placed in functions. So the search part of the code and even the evaluation looks remarkably similiar. I am still impressed by this reverse engineering job. But I feel bad. ...
by bob
Wed Jul 11, 2007 3:08 pm
Forum: Computer Chess Club: General Topics
Topic: Sensational! Y.Ossipov talking about STRELKA
Replies: 59
Views: 40572

Re: Sensational! Y.Ossipov talking about STRELKA

The author hinted that Vasik had also used Fruit (and Vasik has admitted to readin Fruit and that it has some benefit). I am not sure how he would know that from a compiled program. For the guys who reviewed Strelka source code...was it similar in structure to Fruit? As I recall they stated the cod...
by bob
Wed Jul 11, 2007 1:54 am
Forum: Computer Chess Club: General Topics
Topic: difficult endgame test
Replies: 22
Views: 7021

Re: difficult endgame test

an outside passer is far safer to reward than things like a rook on the 7th, yet everyone does the latter, but not the former. :) outside passed pawns are a very common theme in endings. distant majorities are more difficult, but also need to be recognized for the very same reason. It is stupid to ...
by bob
Wed Jul 11, 2007 1:51 am
Forum: Computer Chess Club: General Topics
Topic: difficult endgame test
Replies: 22
Views: 7021

Re: difficult endgame test

I ran this with crafty... it finds this move at depth=11, .1 seconds, on my core2 duo laptop. by depth=18, .5 seconds, the score is in black's favor by 1/2 pawn.... by depth 21, it is 1.5 pawns in blacks favor, taking about 2 seconds... Hamsters misses but it's all in the evaluation... I followed C...
by bob
Tue Jul 10, 2007 10:37 pm
Forum: Computer Chess Club: General Topics
Topic: difficult endgame test
Replies: 22
Views: 7021

Re: difficult endgame test

my only quibble is that it doesn't realize it is absolutely winning, and only thinks it has a small positional edge. It is totally winning.
by bob
Tue Jul 10, 2007 10:36 pm
Forum: Computer Chess Club: General Topics
Topic: difficult endgame test
Replies: 22
Views: 7021

Re: difficult endgame test

an outside passer is far safer to reward than things like a rook on the 7th, yet everyone does the latter, but not the former. :) outside passed pawns are a very common theme in endings. distant majorities are more difficult, but also need to be recognized for the very same reason. It is stupid to f...
by bob
Tue Jul 10, 2007 10:33 pm
Forum: Computer Chess Club: General Topics
Topic: difficult endgame test
Replies: 22
Views: 7021

Re: difficult endgame test

I ran this with crafty... it finds this move at depth=11, .1 seconds, on my core2 duo laptop. by depth=18, .5 seconds, the score is in black's favor by 1/2 pawn.... by depth 21, it is 1.5 pawns in blacks favor, taking about 2 seconds... Hamsters misses but it's all in the evaluation... I followed C...
by bob
Tue Jul 10, 2007 10:30 pm
Forum: Computer Chess Club: General Topics
Topic: difficult endgame test
Replies: 22
Views: 7021

Re: difficult endgame test

I'm not sure why your program would like white better. Black has a passed pawn. White has a weak pawn that can't move (backward). Black's king is in position to support its passer. Etc... You are right... evaluation of this part sucks, but I've never been good in scoring passed pawns. The tables be...
by bob
Tue Jul 10, 2007 9:04 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: iterative deepeniing and branching factor
Replies: 32
Views: 14380

Re: iterative deepeniing and branching factor

I've never had a side to move bonus, except for pawn endings where the side to move determines whether a pawn is catchable, or whether a pawn is unstoppable due to opposition. But for normal positions, I don't do it because I know of no reliable way to do so. And with the depths we see today, and t...
by bob
Tue Jul 10, 2007 5:21 pm
Forum: Computer Chess Club: General Topics
Topic: Difference Checker for Clones
Replies: 3
Views: 1711

Re: Difference Checker for Clones

This seems like a task better suited for a computer. If a secure way could be developed to submit encrypted code of two different programs and let the computer calculate and generate statistics on common code then no human would ever have to see a programmer’s code and it might then be easier to de...