Author: Uri Blass
Date: 23:24:42 12/11/00
Go up one level in this thread
On December 11, 2000 at 20:27:43, Christophe Theron wrote:
>On December 11, 2000 at 14:54:19, Mogens Larsen wrote:
>
>>On December 11, 2000 at 13:56:17, Christophe Theron wrote:
>>
>>>That's not true. Programs DO plan.
>>
>>No, they don't. Not by any definition of the word.
>>
>>Programs behave like a donkey following a carrot on a stick. Wherever the
>>programmer points the stick the program follows. Changing the size of the carrot
>>or the length of the stick doesn't matter.
>
>
>
>Excuse me Mogens, but I believe I have some knowledge about what's going on in a
>chess program (mine for example), and I can assure you that programs DO plan.
The question is what is your definition of planning.
I can give you example of what I mean by planning when I have the impression
that programs do not plan.
[D]8/5k2/6p1/3K1p1p/1R3P1P/6P1/3b4/8 w - - 0 1
I believe that Gandalf drew it with white against Fritz because it was not
planning.
I thought about the position and found the following idea
White has to make progress in order to win.
In order to make progress white has to push the king forward or to play g4 at
some point.
My plan is to push the king forward and to play Ke5,Kf6 because g4 seems not to
help much.
I cannot play these moves if the black bishop catch the long diagnol(a1-h8)
so in order to win the game white has to prevent black to catch this diagnol.
Here is the relevant analysis with Junior that suggest that my plan probably
gives a win for white.
83. Rb7+ Kf6 (
83... Kf8 84. Rc7 Ba5 85. Rc5 Bb4 {2.21/21 173} 86. Rc4 Be1 {2.80/25 802} 87.
Ke6 Bxg3 {2.80/22 24} 88. Kf6 Bxh4+ {2.80/21 16} 89. Kxg6 Bf2 {2.95/21 112} 90.
Kxh5 Kf7 {3.20/22 91} 91. Kg5) 84. Rb6+ Kf7 85. Rc6 Be1 {1.91/24 309} 86. Ke5
Kg7 {1.91/15 4} 87. Rc7+ Kh6 {1.92/18 15} 88. Kf6 Bxg3 {2.03/19 42} 89. Rg7
Bxf4 {2.13/21 58} 90. Rxg6+ Kh7 {2.13/3 4} 91. Kxf5 Bc7 {2.75/23 82} 92. Rg5
Bd8 {2.75/22 38} 93. Rxh5+ Kg7 {2.80/23 27} 94. Kg4
White sacrifices pawns if you do not search deep enough but it helps it to make
progress.
The problem is not to find 83.Rb7+(Rc4 may be also winning and even the game
move(Rb1) may win if you try to go back to the correct plan to get the bishop
out of the diagnol when black may prevent it by the plan to put the king at
f8,f7,g7 but in this case Ke6 with g4 may be good for white) but to do the plan
to get the king forward.
Uri
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