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Subject: Re: Strange ChessTiger 2004 accessment

Author: Harald Faber

Date: 14:05:16 11/10/04

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On November 10, 2004 at 16:47:23, Oreopoulos Kostas wrote:

>On November 10, 2004 at 15:37:59, Harald Faber wrote:
>
>>On November 10, 2004 at 14:14:39, Oreopoulos Kostas wrote:
>>
>>>[D] 1Q6/3b2pp/p1k1p3/8/4N3/Pp2b3/2q3PP/5R1K b - - 6 1
>>>
>>>In that position it evalutates the position as won on both normal and gambit
>>>styles.
>>>Not better , but won.
>>
>>
>
>>00:30:38.1	-1,66	17	1953547759	Be3-c5 Ne4xc5 Kc6xc5 Qb8-f8+ Kc5-c6 Qf8-f3+
>>Kc6-d6 Rf1-d1+ Kd6-e7 Qf3-g4 Qc2-c3 Qg4-h4+ Ke7-e8 Qh4xh7 Bd7-b5 a3-a4 Bb5xa4
>>
>>Is this what shows a won position? I say: Never
>>Is it? For me it is not.
>
>
>Actually the score after both Qd3 or Kd5 should be 0.0 or close to zero.
>-1.66 is almost 2 pawns up. For me that is almost won.
>And of course it VERY BAD evaluation. How can you expect CT2004 to play well if
>he over-under estimates a position so much.?
>
>Dont you agree?


No. I know how Tiger evaluates. I often see draw positions which Tiger does not
evaluate as 0.00, although Tiger shows 3-times repitition. For exact
interpretation of Tigers evals I suggest to ask Christophe Theron.
For me this looks like another case of "uh, my program shows +/- x.y but the
position is not won/lost". The mistake is: You trust the evals too much. I
*know* that even Shredder and Fritz sometimes show +2, +3 and do not win. So my
suggestion is: Trust your own eyes, not (only) the engine's eval.

You find examples within my Tiger 2004 tournament games on www.harald-faber.de



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