Author: Tim Foden
Date: 11:54:36 10/05/01
Go up one level in this thread
On October 05, 2001 at 13:24:57, Koundinya Veluri wrote:
In my other reply I misread your comments, and thought that you meant that
*both* of the sequences should have a score of -2500. Sorry about that.
>On October 04, 2001 at 07:03:14, Tim Foden wrote:
>
>>Hi All,
>>
>>I decided that I would add a 2nd SEE to GLC to check whether GLC's SEE was
>>working. I actually ported GCP's Sjeng SEE (that was posted to the forum a
>>while ago).
>>
>>Both SEE routines now agree in most curcumstances, but one's like the following
>>have cropped up (where they disagree):
>>
>>[D]5rk1/1pp2R1p/p1pb4/6q1/3P1p2/2P4r/PP1BQ1P1/5RKN w - - 2 0
>>
>>This can be evaluated in 2 ways...
>>
>>(1) BxP (+1000) BxB (-3500) R1xB (+3500) QxR (-5500) RxQ (+10000) RxR (-5500)
>>.........+1000.......-2500........+1000.......-4500........+5500...........0
>>
>>>>> value = 0
>>
>>(2) BxP (+1000) BxB (-3500) R7xB (+3500) RxR (-5500) RxR (+5500) QxR (-5500)
>>.........+1000.......-2500........+1000.......-4500.......+1000.......-4500
>
>My SEE doesn't differentiate between the two different methods. It actually
>returns -200 (-2000 in your case) and when I traced it, I found this:
>
>BxP (+100) BxB (-300)
>.....+100.......-200
>
>It stops there because it sees that capturing with a rook would lead to more
>losses (it assumes the second case, where black captures with the rook first).
>So the second case should really be terminated after BxP BxB, which would result
>in a score around -200 (or -2000).
^^^^ == -2500 (which is the score after BxB)
I agree. that is why I said the second sequence had a score of -2500 (see
below). The reason the whole sequence is given above is just for illustrative
purposes.
>Koundinya
>
>>
>>>>> value = -2500
>>
>>So... on to the questions:
>>
>>a) Does anyone's SEE do anything intelligent in these cases?
>>
>>b) Is one of these right, and the other wrong? If so, which one?
>>
>>c) Do we actually care, as long as the SEE works in the majority of cases?
>>
>>Cheers, Tim.
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