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Subject: Re: endgame test position

Author: Will Singleton

Date: 19:44:50 02/21/06

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On February 21, 2006 at 22:27:37, Will Singleton wrote:

>On February 21, 2006 at 22:02:42, Jon Dart wrote:
>
>>[D] 8/6p1/8/1K4p1/P7/1n6/6k1/6B1 w - -
>>
>>How long to find Bb6 with a + score? (Ba7 is also good).
>>
>>--Jon
>
>Amateur 2.86 (32 secs, amd 4200+):
>
>15  85   484   3230297  Be3 Kf3 Bxg5 Ke4 Kc4 Na5 Kc5 Nb3 Kb5 Nd4
>16  86  1210   8354042  Be3 g4
>17  85  1861  12636363  Be3 Kf3
>17 170  3270  22212398  Bb6 g6 Kc4 Nd2 Kd3 Nf3 a5 Ne5 Kc3 Nd7 Bd8 Nc5
>18 454  8938  60402156  Bb6 Kh1
>19 457 15951 108895881  Bb6 Kf3 Kb4 Ke4 Kxb3 Kd5 a5 Kc6 Kc4 Kb7 Kd4 Ka6
>                        Ke4 g6 Bc7 Kb7 Bd8 g4
>
>Rybka gets it in < 1 sec, but I didn't see another program get it fast in
>limited testing.
>
>Will


Ack, you fooled me, I think.  Isn't Bb6 actually a draw?  Even though Rybka and
Spike give +4 immediately, I think it's because they can't see that the king can
block the a pawn indefinitely.  Or, is there some egdb that shows a solution?

Will



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