Just another test position

Discussion of anything and everything relating to chess playing software and machines.

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kiroje

Re: Crafty 22.8

Post by kiroje »

bob wrote:
kiroje wrote:
Eelco de Groot wrote:I do not understand all of Crafty's output, I interpret the numbers between brackets as seconds but in the last lines there is a number of 1.04 seconds, if that is for 18 plies that would be very fast even for Crafty :)
It is seconds, i dont know why it says 1 second at the fail high(maybe its something with the copying from the scid interface ?)
Also note that in your output, it found the correct move at depth 17, not depth 18...
Yes it was a typo :)

Ive used Crafty almost exclusively analysing my own games and is quite happy with the improvements it have been showing(just wanted to tell)

But is it an eval issue that it sticks to Nd5 for so long ?

Other engines(glaurung 2.2 and Rybka) seems quite much faster in finding Rdf1.
royb
Posts: 566
Joined: Thu Mar 09, 2006 12:53 am

Re: Crafty 22.8

Post by royb »

I must say that I too have been greatly enjoying Crafty 22.8. It's quite strong (not top tier by ANY means but still very strong and useful for analysis of games) and when compiled with -DSKILL option, you can set skill=10 (or whatever level works for you) and get a decent game against it without getting brutally defeated by a full strength engine.
kiroje

Re: Crafty 22.8

Post by kiroje »

royb wrote:I must say that I too have been greatly enjoying Crafty 22.8. It's quite strong (not top tier by ANY means but still very strong and useful for analysis of games) and when compiled with -DSKILL option, you can set skill=10 (or whatever level works for you) and get a decent game against it without getting brutally defeated by a full strength engine.
I only use it for analysing, not playing :)
bob
Posts: 20943
Joined: Mon Feb 27, 2006 7:30 pm
Location: Birmingham, AL

Re: Crafty 22.8

Post by bob »

kiroje wrote:
bob wrote:
kiroje wrote:
Eelco de Groot wrote:I do not understand all of Crafty's output, I interpret the numbers between brackets as seconds but in the last lines there is a number of 1.04 seconds, if that is for 18 plies that would be very fast even for Crafty :)
It is seconds, i dont know why it says 1 second at the fail high(maybe its something with the copying from the scid interface ?)
Also note that in your output, it found the correct move at depth 17, not depth 18...
Yes it was a typo :)

Ive used Crafty almost exclusively analysing my own games and is quite happy with the improvements it have been showing(just wanted to tell)

But is it an eval issue that it sticks to Nd5 for so long ?

Other engines(glaurung 2.2 and Rybka) seems quite much faster in finding Rdf1.
The question is, what are the eval numbers for Nd5 vs Rf1? If they are close, then it is an eval issue. I have seen several positions posted here where Crafty finds the correct move far faster than (say) Rybka. But the "find" is not tactical in nature, it is positional. Every program evaluates things from king safety to pawn structure and passed pawns differently, and those little differences can make a big difference in positions where the best move is only separated from another move by a very small positional score...
Will Singleton
Posts: 128
Joined: Thu Mar 09, 2006 5:14 pm
Location: Los Angeles, CA

Re: Just another test position

Post by Will Singleton »

Amateur gets it pretty fast (27 sec on an athlon 2.2ghz):

11 73 1026 5925022 Nd5 Be6 Rf1 Rf8 h4 Qd8 Nxb6 cxb6 Bb5
12 73 2021 11538136 Nd5 Be6 Rf1 Qg6 g4 Ba5 b4 Bb6 Qg3 Rd8
12 81 2762 15776581 Rf1 Rf8 h4 Qh6 d4 Ba5 g4 Qf6 Bd5 Bb6 h5 Qd8
13 103 6378 36921050 Rf1 Bd7 h4 Qf6 Nd5 Qxf3 Rxf3 Be6 b4
14 115 10891 62492384 Rf1 Rf8