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

Author: Robert Hyatt

Date: 11:08:01 02/13/01

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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.



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