Engine Style

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Engine Style

Post by maxchgr » Mon Jun 04, 2007 3:13 pm

Hi all
engine elo is commonly being tested and compared but I wanted to know if anyone has any useful information/observations regarding various engine styles, and perhaps any engines that are particularly good for analysis of one's games for 'intereseting' possibilities in a human game.

im interested in understanding differences between engines like


thanks a lot guys for any responses
this topic is really interesting to me!


Re: Engine Style

Post by maxchgr » Tue Jun 05, 2007 1:57 am

Is this topic not interesting to anyone else? :o

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Kirill Kryukov
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Re: Engine Style

Post by Kirill Kryukov » Tue Jun 05, 2007 5:20 am

In CCRL study we are trying to compare playing styles of different engines by computing ponder hit and evaluation difference values. It is done automatically for all games in our database that have necessary information. Note that while we are able to define and measure the similarity or difference between styles of two engines, we are not yet close to understanding it. :-)

Correlation page in CCRL 40/40
Correlation page in CCRL 40/4

Also you can construct ponder hit and eval diff tables for any custom set of engines if you use "Custom comparison" section on the main page (CCRL 40/40 main page, CCRL 40/4 main page).



Re: Engine Style

Post by maxchgr » Tue Jun 05, 2007 6:47 am

Hmm thats quite interesting.
Thanks krill :o

does anyone have a subjective opinion on styles of the engines?

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Marek Soszynski
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Re: Engine Style

Post by Marek Soszynski » Tue Jun 05, 2007 7:37 am

Here are my comments on various engines' styles. Be advised that my comments are highly subjective albeit based on extensive usage. I expect disagreement.
  • Fritz - very strong and suitably aggressive in all phases
  • Hiarcs - extremely strong, often appears to play according to a plan, which gives it a human-like feel
  • Junior - its relative strength and gambit/sacrificial style of play is not what it was
  • Ktulu - gives a good impression of strategical play, but only a medium strength engine overall
  • Loop - extremely strong, particularly aggressive in the opening
  • Rybka - conservative in the opening, without equal in the middlegame when in a dozen or so moves it can turn an inferior position into a superior one, even against top engines, through subtle manoeuvring and super-accurate piece placement
  • Shredder - very classical, orthodox play, still probably the best endgame engine
Marek Soszynski


Re: Engine Style

Post by maxchgr » Tue Jun 05, 2007 4:33 pm

Thank you marek, thats exactly the type of response I was interested in reading. It's subjective but style can't be quantified, can it? ... :)

Does anyone else have anything to say on the matter?

(btw regarding junior, I agree, it doesn't strike me as particularly sacrificial or speculatively interesting as it used to be compared to fritz for example, which saddens me =] Is it version 6 that was the most interesting in that regard?)

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Dr.Wael Deeb
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Re: Engine Style

Post by Dr.Wael Deeb » Tue Jun 05, 2007 4:51 pm

Hi Maksim,
To know well the engine style,the best way is to play against it along with observing it playing against the other engines....
Now regarding Junior,the most spectacular version in my opinion is Deep Junior 7 :!:
_No one can hit as hard as life.But it ain’t about how hard you can hit.It’s about how hard you can get hit and keep moving forward.How much you can take and keep moving forward….

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Re: Engine Style

Post by gerold » Tue Jun 05, 2007 7:46 pm

maxchgr wrote:Is this topic not interesting to anyone else? :o
I think Deep Junior 10 is the best for learning chess attack
Watch its sacrifice attack style.

Go Junior,



Re: Engine Style

Post by cooldalek » Tue Jun 05, 2007 8:08 pm

gerold and Marek seem to have different views on Junior 10.

Anyone want to add a third opinion?

Is it still "speculative"?

I am toying with buying it


Re: Engine Style

Post by maxchgr » Wed Jun 06, 2007 12:35 am

From what I've seen it is no more aggressive than Fritz 10, I was wondering if thats an unpopular concencus

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