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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