Author: Ernst A. Heinz
Date: 03:36:49 11/17/98
Go up one level in this thread
On November 16, 1998 at 18:19:53, Amir Ban wrote:
>On November 16, 1998 at 14:50:57, Bruce Moreland wrote:
>
>>r1r1q1k1/6p1/p2b1p1p/1p1PpP2/PPp5/2P4P/R1B2QP1/R5K1 w - - 0 1
>>
>>It has been contended that this move would be difficult for a computer to find,
>>and this has caused some doubts to be raised as to whether the computer found it
>>without assistance in this game.
>>
>>I would like to ask how we can clear this up absent input from DB.
>>
>>Has anybody run this for a long period on a micro, and if so, was any move
>>selected other than 35. Qb6?
>>
>>Is the counter-attacking line 35. Qb6 Qe7 36. axb5 Rab8 37. Qxa6 e4 supposedly
>>the reason that white shouldn't play 35. Qb6? Or is it some other line? If it
>>is too hard or impossible to find 35. axb5, would finding this line show
>>anything?
>>
>>Is there some minimum score delta we can achieve between the position after 35.
>>axb5 and 35. Qb6 that might be evidence that DB should be given the benefit of
>>the doubt?
>>
>>Are these questions unfair or wrong, if so, are their other questions that can
>>be asked and possibly answered that will help clear this up?
>>
>>bruce
>
>
>This is move 36 but the other details are correct.
>
>The first time this was discussed on CCC, Chris Whittington was still here, and
>he reported for CSTal. It was closer than others, but still couldn't bridge the
>gap.
I fed this position into the current "DarkThought" yesterday and it liked Qb6
with a score of roughly +1.7 up to iteration #18 inclusively. Then, it failed
low on Qb6 (score <= 1.39) in iteration #19 after processing 6,490,725,565
nodes. Currently, it is still engaged in resolving the fail-low (see below).
////////////////////////////////////////////////////////////////////////////////
r1r1q1k1/6p1/p2b1p1p/1p1PpP2/PPp5/2P4P/R1B2QP1/R5K1 w - - 0 1
# Clearing chess engine.
# Engine sleeps.
- -
+------------------------+
8 |*R :::*R :::*Q :::*K :::|
7 |::: ::: ::: *P: |
6 |*P ::: *B: *P: *P:|
5 |:::*P ::: P *P: P ::: |
4 | P :P:*P ::: ::: :::|
3 |::: :P: ::: ::: P |
2 | R ::: B ::: :Q: P :::|
1 |:R: ::: ::: :K: |
+------------------------+
a b c d e f g h
14.01 Qb6 Rd8 Be4 Rac8 Qxa6 bxa4 Qxa4 Qxa4 Rxa4 Rd7 ... (1.71) #62711053
15.01 Qb6 Rd8 Be4 Rac8 Qxa6 bxa4 Qxa4 Qh5 Kh2 Qg5 ... (1.69) #140398448
16.01 Qb6 Rd8 Be4 Rac8 Qxa6 bxa4 Qxa4 Qh5 Qa7 ... (1.70) #423411650
17.01 Qb6 Rd8 Be4 Rac8 Qxa6 bxa4 Qxa4 Qh5 Qa7 Qh4 ... (1.73) #1230726361
18.01 Qb6 Rd8 Be4 a5 axb5 axb4 Rxa8 Rxa8 Rxa8 Qxa8 ... (1.64) #3337837066
19.01 Qb6 <=178? (1.39) #6490725565
////////////////////////////////////////////////////////////////////////////////
=Ernst=
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