Author: Jeremiah Penery
Date: 02:19:06 12/16/99
Go up one level in this thread
On December 15, 1999 at 11:44:52, Torstein Hall wrote:
>Take the following position and setup on your PC:
>
>4b3/1r4k1/p3pr2/1p1pPp2/PPpP1Pp1/2P3Pp/K6P/8 w - - 0 1
>
>Every human would play 1.a5 without thinking, but your chessprogram plays
>1.exf6+??? It may be wrong to call a program stupid but.....
>
>Torstein
>
>( So far I have only tried it on Fritz 6 and Hiarcs 7.32 )
I added some special knowledge to my modified Crafties a while back that deals
with exactly this type of position. It was a very simple change (1 easy 'if'
statement), and does a good job of 'solving' these positions. It doesn't break
easily, either. (I've not found any instances when it evaluates this wrongly
because of this code.) If you change, for example, the color of black's bishop
in this position, I will not get a drawish score here, because it will see black
'sacrificing' its bishop for one of white's pawns so that it is no longer locked
up.
This is what I get here:
depth time score variation (1)
1 0.00 -1.23 1. a5
1-> 0.51 -1.23 1. a5
2 0.51 -- 1. a5
2 0.51 -1.63 1. a5 Kg6
2-> 0.52 -1.63 1. a5 Kg6
3 0.52 ++ 1. a5!!
3 0.52 -1.23 1. a5 Kg6 2. Kb2
3-> 0.52 -1.23 1. a5 Kg6 2. Kb2
4 0.53 -- 1. a5
4 0.53 -1.63 1. a5 Kf7 2. Kb2 Ke7
4-> 0.53 -1.63 1. a5 Kf7 2. Kb2 Ke7
5 0.55 ++ 1. a5!!
5 0.56 -1.23 1. a5 Kf7 2. Kb2 Ke7 3. Kc2
5-> 0.56 -1.23 1. a5 Kf7 2. Kb2 Ke7 3. Kc2
6 0.62 -1.47 1. a5 Kf7 2. Kb2 Ke7 3. Kc2 Bc6
6-> 0.63 -1.47 1. a5 Kf7 2. Kb2 Ke7 3. Kc2 Bc6
7 1.09 ++ 1. a5!!
7 1.10 -1.07 1. a5 Kf7 2. Kb2 Bc6 3. Kc2 Ke7 4.
Kd2
7-> 1.10 -1.07 1. a5 Kf7 2. Kb2 Bc6 3. Kc2 Ke7 4.
Kd2
8 1.50 -1.23 1. a5 Kf7 2. Kb2 Bc6 3. Kc2 Ke7 4.
Kd2 Rd7
8-> 1.51 -1.23 1. a5 Kf7 2. Kb2 Bc6 3. Kc2 Ke7 4.
Kd2 Rd7
9 2.00 -0.88 1. a5 Kf7 2. Kb2 Bc6 3. Kc2 Ke7 4.
Kd2 Rd7 5. Ke3
9-> 2.00 -0.88 1. a5 Kf7 2. Kb2 Bc6 3. Kc2 Ke7 4.
Kd2 Rd7 5. Ke3
10 3.11 -0.94 1. a5 Kf7 2. Kb2 Bc6 3. Kc2 Ke7 4.
Kd2 Rd7 5. Ke3 Rd6
10-> 3.12 -0.94 1. a5 Kf7 2. Kb2 Bc6 3. Kc2 Ke7 4.
Kd2 Rd7 5. Ke3 Rd6
11 3.97 -1.23 1. a5 Kf7 2. Kb2 Bc6 3. Kc2 Ke7 4.
Kd2 Rd7 5. Ke3 Rd6 6. Ke2
11-> 4.02 -1.23 1. a5 Kf7 2. Kb2 Bc6 3. Kc2 Ke7 4.
Kd2 Rd7 5. Ke3 Rd6 6. Ke2
12 6.71 -1.23 1. a5 Kf7 2. Kb2 Bc6 3. Kc2 Ke7 4.
Kd2 Ra7 5. Ke2 Rd7 6. Kd2 Rf8
12-> 6.77 -1.23 1. a5 Kf7 2. Kb2 Bc6 3. Kc2 Ke7 4.
Kd2 Ra7 5. Ke2 Rd7 6. Kd2 Rf8
13 10.83 -1.23 1. a5 Kf7 2. Kb2 Bc6 3. Kc2 Ke7 4.
Kd2 Rd7 5. Ke2 Rd6 6. Ke3 Rf8 7. Ke2
13-> 11.06 -1.23 1. a5 Kf7 2. Kb2 Bc6 3. Kc2 Ke7 4.
Kd2 Rd7 5. Ke2 Rd6 6. Ke3 Rf8 7. Ke2
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.