Author: Robert Hyatt
Date: 10:19:50 08/27/99
Go up one level in this thread
On August 27, 1999 at 06:34:21, Ralf Elvsén wrote:
>On August 26, 1999 at 12:03:21, Robert Hyatt wrote:
>
>>On August 26, 1999 at 05:24:00, Jouni Uski wrote:
>>
>>>FEN 7r/3K1k1P/4p3/4p3/4P3/8/8/5R2 b - - 0 0
>>>
>>>Isn't Kg7 easily losing but Kg6 drawing? What does Your program with
>>>tablebases think? Most programs would never make this stupid mistake...
>>>
>>>Jouni
>>
>>
>>His losing move was the last Rh8. Crafty was analyzing on ICC and prior to
>>this move was suggesting either Kf7 or Kf6 as drawing (ending up in a deep
>>tablebase hit). When he played Rh8 Crafty's score went to +3.5 and never went
>>back down...
>>
>>Bob
>>
>>I think it was move 71 for black. Crafty was searching 18-19 plies deep here
>>and found what looked like a direct drawing line.
>
>I (or Hiarcs or Crafty on my machine) can't find a win for
>white after Kg6. It would be very interesting to
>see a forced line.
>
> Thanks, Ralf
I let Crafty stew on this with 4 cpus, all the 5 piece tablebases... the score
continually goes up for white. at depth=17, 1 minute, score is +2.34... at
depth=18, after 1:38, it goes to +3. After a couple of more plies, I get this:
1. Rh1 Kf6 2. Rh2 Kf7 3. Kd6 Kf6 4. Rf2+ Kg6 5.
Kxe5 Kg7 6. Ra2 Rc8 7. Rh2 Kh8 8. Kxe6 Re8+ 9. Kf5
Rf8+ 10. Kg5 Re8 11. Kf4 Rf8+ 12. Kg5
Score at this point is +4.20, which is getting pretty close to a forced
win, but no matter what, black is in dire trouble here...
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