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Subject: Re: Hard endgame position

Author: Howard Exner

Date: 19:47:18 03/01/00

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On March 01, 2000 at 22:33:16, Robert Hyatt wrote:

>On March 01, 2000 at 02:58:49, Dann Corbit wrote:
>
>>On March 01, 2000 at 01:37:17, Janos Keinrath wrote:
>>
>>>Hi!
>>>
>>>Yesterday I saw an intresting endgame position on ICC.
>>>
>>>[D]8/8/6k1/3p4/3P4/2P2PKp/pB4b1/8 b - -
>>>
>>>This is the final position of a blitz game played by Amateur
>>>with black. The game ended with rep. draw, but I feel black somehow
>>>can win. Could you check the position? What is the winning plan?
>>
>>Crafty likes Kf5 from the get-go, but the evaluation does not climb over one
>>pawn until ply 19.  I'd be surprised if programs see a win at normal game-type
>>time controls (other than 'postal' games).
>
>
>Don't forget "good hardware".  I get a fail high at depth=18, 35 seconds, on the
>quad 550 (big hash, etc).  score is +1.76:
>
>               18    35.99     ++   1. ... Kf5!!
>               18     1:06   1.76   1. ... Kf5 2. c4 dxc4 3. d5 Bf1 4.
>                                    Bh8 Be2 5. d6 Ke6 6. f4 Bg4 7. Be5
>                                    c3 8. Bxc3 Kxd6 9. Kh2 Bf5 10. Ba1

In the above white can play 5. Kxh3 instead of d6. If 5. ... Bxf3 6. Kg3 Bxd5
7. Kf2 = Unless black has something better?
>
>19 plies took 15 more seconds, up to +1.86.  20 was done in just over 2 minutes,
>score creeping up slowly iteration by iteration.
>
>This might be found in a blitz game, the search would be faster if it had an
>old hash table already primed with data.  And thinking on the opponent's time
>would likely help too.



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