Author: Robert Hyatt
Date: 07:25:44 12/08/99
Go up one level in this thread
On December 08, 1999 at 07:32:33, Alexander Kure wrote:
>Hi everybody,
>
>When working through Nimzo's games he recently played on ICC i came across a
>game he played against Crafty which led to the following pawn endgame (Crafty
>white, Nimzo black):
>
I watched this game and thought "wow" when I saw it. I chose to not mention
it (I usually don't) as it seems pointless to criticize a program's lack of a
bit of knowledge...
>6k1/p6p/4p1p1/8/8/1P6/P5PP/5K2 w - - 0 39
>
>The resulting position is a 'simple' win for white dispite the fact that black
>has a passed center pawn. White's pawn majority on the queenside will lead to a
>remote passed pawn which will result in a win for white.
>I am interested in the static evaluation of this position of various chess
>programs. Which programs recognize that this position is a win for white?
my evaluation here is +.63:
note: scores are for the white side
material evaluation................. 0.00
development......................... 0.00
pawn evaluation..................... 0.01
passed pawn evaluation.............. -0.20
passed pawn race evaluation......... 0.00
king safety evaluation.............. 0.00
interactive piece evaluation........ 0.82
total evaluation.................... 0.63
Note that "interactive piece evaluation" is ambiguous... Some pawn scoring
slips into that as well (candidate/outside passers for one thing). I have to
fix that one day...
To see these numbers in crafty, just drag the FEN into the crafty window and
paste/drop it. then type "score"...
>
>The next step is how to avoid this position when confronted with it in the
>search. Here is the position a few moves ago:
>
>6k1/p4p1p/4B1p1/8/8/1P6/P5PP/2q2QK1 b - - 0 37
>
>Black just checked White's king on c1 and White defended by moving his queen to
>f1.
>Now the question is: Which programm with black to move avoids the queen exchange
>which leads to the lost pawn endgame above?
crafty goes for a perpetual here:
time surplus 0.00 time limit 166:39 (166:39)
nss depth time score variation (1)
8 0.67 0.00 1. ... Qc5+ 2. Qf2 Qc1+ 3. Qf1
8-> 0.76 0.00 1. ... Qc5+ 2. Qf2 Qc1+ 3. Qf1
9 0.98 0.00 1. ... Qc5+ 2. Qf2 Qc1+ 3. Qf1
9-> 1.13 0.00 1. ... Qc5+ 2. Qf2 Qc1+ 3. Qf1
10 1.51 0.00 1. ... Qc5+ 2. Qf2 Qc1+ 3. Qf1
10-> 3.11 0.00 1. ... Qc5+ 2. Qf2 Qc1+ 3. Qf1
11 4.50 0.00 1. ... Qc5+ 2. Qf2 Qc1+ 3. Qf1
11-> 5.26 0.00 1. ... Qc5+ 2. Qf2 Qc1+ 3. Qf1
12 9.90 0.00 1. ... Qc5+ 2. Qf2 Qc1+ 3. Qf1
12-> 10.82 0.00 1. ... Qc5+ 2. Qf2 Qc1+ 3. Qf1
13 20.87 0.00 1. ... Qc5+ 2. Qf2 Qc1+ 3. Qf1
13-> 23.26 0.00 1. ... Qc5+ 2. Qf2 Qc1+ 3. Qf1
Note that is from my notebook, not the quad xeon.
>Now instead of exchanging queens by 1...Qxf1?? 2.Kxf1 fxe6 leading to the lost
>pawn endgame above the sequence 1...Qe3+ 2.Kh1 (2.Qf2 Qc1 repeats the position
>or 2.Qf2 Qxe6!?) and now 2...fxe6! (2...Qe6 is not so intersting) will lead to
>an interesting position.
>
>Greetings
>Alex
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