Computer Chess Club Archives


Search

Terms

Messages

Subject: Re: crafty under-estimate R against 2p

Author: Francois Bertin

Date: 16:09:04 02/13/01

Go up one level in this thread


On February 13, 2001 at 14:08:01, Robert Hyatt wrote:

>On February 13, 2001 at 12:42:45, Vincent Lejeune wrote:
>
>>On February 13, 2001 at 10:09:37, Robert Hyatt wrote:
>>
>>>On February 13, 2001 at 07:58:17, Vincent Lejeune wrote:
>>>
>>>>
>>>>We are in late-middlegame-early-endgame :
>>>>
>>>>3n4/ppk4p/2p3p1/2b2p2/P4P2/2N3K1/1PP5/4R1N1 b - - 0 30
>>>>
>>>>
>>>>Crafty 18.01 gives only +2.50 for white here.
>>>>Hiarcs 7.32 give +4.00 (as I would judge this position too)
>>>
>>>
>>>You are doing something wrong.  Here is the search output from
>>>18.1:
>>>
>>>                8->   1.79   4.52   1. ... Nf7 2. Nh3 Bd6 3. Kf3 h5 4.
>>>                                    Re6 Bxf4 5. Rxg6
>>>                9     2.59   4.56   1. ... Nf7 2. Nf3 Bd6 3. Ne2 Kb6 4.
>>>                                    Nh4 Ng5 5. Nd4 Kc5
>>>                9->   3.50   4.56   1. ... Nf7 2. Nf3 Bd6 3. Ne2 Kb6 4.
>>>                                    Nh4 Ng5 5. Nd4 Kc5
>>>               10     5.48   4.69   1. ... Nf7 2. Nf3 Bd6 3. Nd4 h5 4.
>>>                                    Kf3 Kb6 5. Re6 g5 6. fxg5 Nxg5+
>>>               10     8.45   4.52   1. ... Bd6 2. Nf3 h5 3. Re8 Kd7 4.
>>>                                    Rg8 Ne6 5. Rxg6 Bxf4+ 6. Kh4 Nf8
>>>         (2)   10->   9.32   4.52   1. ... Bd6 2. Nf3 h5 3. Re8 Kd7 4.
>>>                                    Rg8 Ne6 5. Rxg6 Bxf4+ 6. Kh4 Nf8
>>>               11    11.36   4.61   1. ... Bd6 2. Nf3 h5 3. Re8 Kd7 4.
>>>                                    Rg8 Ne6 5. Rxg6 Bxf4+ 6. Kh4 Bc1 7.
>>>                                    Ne5+ Kd6
>>>               11->  15.38   4.61   1. ... Bd6 2. Nf3 h5 3. Re8 Kd7 4.
>>>                                    Rg8 Ne6 5. Rxg6 Bxf4+ 6. Kh4 Bc1 7.
>>>                                    Ne5+ Kd6
>>>
>>>I don't know whether you set the position up wrong or what, but obviously
>>>it doesn't think this is +2.
>>
>>The only wrong think I've done is running crafty as engine in chessbase
>>interface, it's 1st time i see such difference in evaluation between the 2
>>version :((((
>>
>>Chessbase probably have done something wrong !
>
>
>They _definitely_ have a problem with the 18.x versions, as the scoring changed
>to +=good for white all the time.  I don't quite see how that can screw this up
>in the way you are describing, but I would take it with a grain of salt if you
>use 18.x and chessbase together.

That's with Chessbase's version of Crafty. I wonder if the problem
would appear if running Crafty in F6 with the Winboard adapter...

FB



This page took 0 seconds to execute

Last modified: Thu, 15 Apr 21 08:11:13 -0700

Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.