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Subject: Re: Doctor 3 avoided axb6

Author: Robert Hyatt

Date: 07:33:01 08/17/99

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On August 17, 1999 at 02:14:10, Ed Schröder wrote:

>On August 16, 1999 at 23:55:49, Robert Hyatt wrote:
>
>>On August 16, 1999 at 14:25:47, blass uri wrote:
>>
>>>
>>>On August 16, 1999 at 12:59:10, Ed Schröder wrote:
>>>
>>>
>>>>But in the end the human knows how to play chess. A computer will never
>>>>find moves like Ra1 (Fischer) or Rxd4 (Kasparov) and and and... Ok, maybe
>>>>in 100 years :-) Just try this (old and simple) one.
>>>>
>>>>5rk1/5p2/pr2pPp1/Pp1pP1Pp/1PpP3P/K1P5/8/8 w - - am a5b6;
>>>
>>>Doctor3 after 16 minutes and 42 seconds on p200MMX:
>>>
>>>Kb2 44/45 with evaluation -10.51
>>>
>>>Uri
>>
>>
>>takes crafty on my PII/300 notebook 1:32 to find Kb2.  Takes my quad xeon
>>about 12 seconds.  Here is PII/300 output:
>>
>>               18->  12.18  -8.14   1. axb6 Rb8 2. Kb2 Rxb6 3. Kc2 a5 4.
>>                                    bxa5 Ra6 5. Kb2 Rxa5 6. Kb1 Ra3 7.
>>                                    Kb2 b4 8. cxb4 Rd3 9. b5 Rxd4
>>               19    18.89  -8.20   1. axb6 Rb8 2. Kb2 Rxb6 3. Kc2 a5 4.
>>                                    bxa5 Ra6 5. Kb2 Rxa5 6. Kb1 Kf8 7.
>>                                    Kb2 Ra4 8. Kb1 b4 9. cxb4 Rxb4+ 10.
>>                                    Kc2 Ke8
>>               19->  19.09  -8.20   1. axb6 Rb8 2. Kb2 Rxb6 3. Kc2 a5 4.
>>                                    bxa5 Ra6 5. Kb2 Rxa5 6. Kb1 Kf8 7.
>>                                    Kb2 Ra4 8. Kb1 b4 9. cxb4 Rxb4+ 10.
>>                                    Kc2 Ke8
>>               20    20.22     --   1. axb6
>>               20    31.67  -9.25   1. axb6 Rb8 2. Kb2 Rxb6 3. Kc2 a5 4.
>>                                    bxa5 Ra6 5. Kb2 Rxa5 6. Kb1 Ra3 7.
>>                                    Kb2 b4 8. cxb4 Rh3 9. Kc2 Rxh4 10.
>>                                    Kd2 Rxd4+ 11. Ke3
>>               20     1:32  -8.62   1. Kb2 Rfb8 2. Kc2 Kf8 3. Kd2 Ke8 4.
>>                                    Ke3 R6b7 5. Kd2 Ra8 6. Ke3 Kd7 7. Kf4
>>                                    Rc8 8. Ke3 Kc6 9. Kf4 Rd7 10. Ke3 Rcc7
>>               20->   1:32  -8.62   1. Kb2 Rfb8 2. Kc2 Kf8 3. Kd2 Ke8 4.
>>                                    Ke3 R6b7 5. Kd2 Ra8 6. Ke3 Kd7 7. Kf4
>>                                    Rc8 8. Ke3 Kc6 9. Kf4 Rd7 10. Ke3 Rcc7
>>               21     2:32  -8.62   1. Kb2 Rfb8 2. Kc2 Kf8 3. Kd2 Ke8 4.
>>                                    Ke3 R6b7 5. Kd2 Ra8 6. Ke3 Kd7 7. Kf4
>>                                    Rbb8 8. Kg3 Re8 9. Kf4 Rad8 10. Ke3
>>                                    Rc8 11. Kf4
>>               21->   2:32  -8.62   1. Kb2 Rfb8 2. Kc2 Kf8 3. Kd2 Ke8 4.
>>                                    Ke3 R6b7 5. Kd2 Ra8 6. Ke3 Kd7 7. Kf4
>>                                    Rbb8 8. Kg3 Re8 9. Kf4 Rad8 10. Ke3
>>                                    Rc8 11. Kf4
>
>That's all nice of course but the score isn't 0.00 as it should be which
>was my point of computers and understanding chess. Every 1500 player
>sees it is a draw as long as you don't capture except computers.
>
>A 100 years before computers will recognize this kind of positions as
>a draw?
>
>Ed Schroder

I don't know about 100 years.. but it is "yae" (yet another exception). :)

IE I handle several exceptions already (B+wrong RP(S), opposite bishops,
who knows what else.)  I can add more.  But each one hurts all the unrelated
positions since time is important...

This is _exactly_ where programs have a huge hole.  Because a human can learn
the 'pattern' once and then apply it in similar (not just identical) cases.
That is hard...



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