Author: Bernhard Bauer
Date: 06:26:43 10/12/99
Go up one level in this thread
On October 12, 1999 at 09:10:40, Jeremiah Penery wrote:
>On October 12, 1999 at 08:47:57, Bernhard Bauer wrote:
>
>>Hallo,
>>
>> +---+---+---+---+---+---+---+---+
>> 8 | | | | | | | *K| |
>> +---+---+---+---+---+---+---+---+
>> 7 | | R | | | | | | |
>> +---+---+---+---+---+---+---+---+
>> 6 | | | | | | | P | *P|
>> +---+---+---+---+---+---+---+---+
>> 5 | | | | *R| *B| *P| | P |
>> +---+---+---+---+---+---+---+---+
>> 4 | | P | | | | B | | |
>> +---+---+---+---+---+---+---+---+
>> 3 | | | | | | | K | |
>> +---+---+---+---+---+---+---+---+
>> 2 | | | | | | | | |
>> +---+---+---+---+---+---+---+---+
>> 1 | | | | | | | | |
>> +---+---+---+---+---+---+---+---+
>> a b c d e f g h
>>FEN: 6k/1R/6Pp/3rbp1P/1P3B/6K/8/8 w
>>
>>this is a position from Nisipeanu vs. Khalifman, Las Vegas, tie-break, game 2.
>>
>>Question: which program can solve this position?
>>IMHO no program can do, but who knows, so I ask.
>>G. Kasparov calls it a mutual Zugzvang position and in the variant he gives the
>>white rook is hold in prison.
>>The best move G. K. gives is Kf3 !!
>
>I assume this move wins for white? What is the variation?
>
>Just getting Kf3, my modified Crafty 16.18 does this in 1:46 (less than 2
>minutes) at ply 13. This is the variation at ply 14 and 2 1/2 minutes:
>
>14 2:34 6.12 1. Kf3 Bxf4 2. Kxf4 Rd1 3. Kxf5 Rf1+
> 4. Ke6 Re1+ 5. Kf6 Rf1+ 6. Ke7 Re1+
> 7. Kd6 Rd1+ 8. Ke5 Re1+ 9. Kd5 Rd1+
> 10. Kc5 Rc1+ 11. Kd4 Rd1+ 12. Ke4 Kf8
>
>I'll let it run all of today and see what happens.
>
>Jeremiah
G. K. writes:
"Only 40.Bxe5?? blew up everything - position after 40...Rxe5 41.Kf4 Rd5
was a mutual Zugzvang! 42.Rh7 doesn't work - 42...Rd4+ 43.Kxf5 Rxb4 44.Rxh6 Rb7!
That's why clever 40.Kf3! would have finished the job - 40...Bxf4 41.Kxf4 and
it's black to move! E.g. 41...Kf8 42.Rh7 Rd4+ 43.Ke5 Rxb4 44.Rxh6 and there is
no more Rb7 cutting white rook on h6."
My crafty (v16.19) gives:
10. Rh7+ Kf6
15-> 7:08 5.15 1. Bxe5 Rxe5 2. Kf4 Rd5 3. Rh7 Rd4+
4. Kxf5 Rxb4 5. Rxh6 Rb7 6. Kf6 Ra7
7. Ke6 Ra6+ 8. Kd5 Ra5+ 9. Ke4 Kg7
10. Rh7+ Kf6
time=10:00 cpu=99% mat=1 n=173934975 fh=87% nps=289712
ext-> checks=12260723 recaps=166361 pawns=1693093 1rep=375265
thrt:44031
predicted=0 nodes=173934975 evals=25173357
endgame tablebase-> probes done=1038 successful=1038
hashing-> trans/ref=49% pawn=5% used=99%
Kind regards
Bernhard
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