Author: Robert Hyatt
Date: 11:15:54 10/01/98
Go up one level in this thread
On October 01, 1998 at 11:40:46, blass uri wrote:
>
>On October 01, 1998 at 08:21:43, Robert Hyatt wrote:
>
>>On October 01, 1998 at 01:11:12, blass uri wrote:
>>
>>>
>>>
>>>
>>>8/1r5p/6p1/8/P2k4/K6P/1R4P1/8 black to move
>>>
>>>Many programs are playing Rxb2 because they computes that white is losing its
>>>pawn in the pawn endgame and do not understand that after Rxb2 Kxb2 Kc4 Kc2 Kb4
>>>Kd3 Kxa4 white is winning.
>>>
>>>Rxb2 is not the first move they want to play because they need time to see that
>>>black wins a pawn by this stupid mistake after Rxb2 Kxb2 Kc4 Ka3
>>>
>>>Is there a program that understand by static evaluation that white is winning
>>>with the king at d3?(static evaluation at least 1.5 pawn advantage for white)
>>>
>>>Uri
>>
>>I get this:
>>
>> +---+---+---+---+---+---+---+---+
>> 8 | | | | | | | | |
>> +---+---+---+---+---+---+---+---+
>> 7 | | *R| | | | | | *P|
>> +---+---+---+---+---+---+---+---+
>> 6 | | | | | | | *P| |
>> +---+---+---+---+---+---+---+---+
>> 5 | | | | | | | | |
>> +---+---+---+---+---+---+---+---+
>> 4 | P | | | *K| | | | |
>> +---+---+---+---+---+---+---+---+
>> 3 | K | | | | | | | P |
>> +---+---+---+---+---+---+---+---+
>> 2 | | R | | | | | P | |
>> +---+---+---+---+---+---+---+---+
>> 1 | | | | | | | | |
>> +---+---+---+---+---+---+---+---+
>> a b c d e f g h
>>
>>Black(1): sc
>>end-game phase
>> clearing hash tables
>>note: scores are for the white side
>>material evaluation................. 1.00
>>development......................... 0.00
>>pawn evaluation..................... 0.12
>>passed pawn evaluation.............. 0.24
>>passed pawn race evaluation......... 0.00
>>interactive piece evaluation........ -0.23
>>total evaluation.................... 1.13
>
>I did not ask about the static evaluation of the originial position but about
>the static evaluation of the position after the line Rxb2 Kxb2 Kc4 Kc2 Kb4 kd3
>kxa4
>
>
>>
>>
>>
>>when I do a search, I never get "rxb2" as reasonable:
>
>programs get Rxb2 as reasonable because of the following line
>Rxb2 Kxb2 Kc4 Ka3 g5 g3 h5 g4 h4 Kb2 Kb4 kc2 kxa4
>they need time to find this line(more than 1 or 2 seconds).
>white also can win this pawn ending but programs do not understand this.
>
>Uri
first, I let crafty search for > 6 minutes. *no* Rxb2.
Next, I tried your variation above where you say "programs do not under stand
this". Would you call this "understanding that white can win that ending"???
time surplus 0.00 time limit 1666:39 (1666:39)
depth time score variation (1)
10 0.30 Mat19 8. Kd3 Kb5 9. Ke4 Kc4 10. Kf5 Kd3 11.
Kxg5 Kd4 12. Kxh4 <EGTB>
10-> 0.31 Mat19 8. Kd3 Kb5 9. Ke4 Kc4 10. Kf5 Kd3 11.
Kxg5 Kd4 12. Kxh4 <EGTB>
time=0.32 cpu=18% mat=0 n=7341 fh=97% nps=22940
IE *some* programs can figure that out quite easily, and not enter a line
that is dead lost. This is probably why I don't get Rxb2 *ever*. It
"knows" better...
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