Author: Richard A. Fowell (fowell@netcom.com)
Date: 23:03:25 10/14/99
Go up one level in this thread
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 !!
>Of course all the null-move programmers will call it a study and studies never
>occur in real games ...
>But here it happend.
>Kind regards
>Bernhard
MacChess 5.01 finds Kf3!! in less than 2 minutes, even on my 180 MHz Macintosh.
Here's the search (I've trimmed the end off all but the last PV, and deleted
the PVs for the first few plies, to make this more readable, and added
some column headers). Note that there is a fairly significant jump in eval
at 12 ply, when MacChess settles on Kf3, and that MacChess continues to like
Kf3 for the 12 hours I ran this (18 ply). I actually ran this for two days,
and it liked Kf3 at 19 ply, too.
Richard A. Fowell (fowell@netcom.com)
http://dmoz.org/Games/Board_Games/Chess/Software/Macintosh/
Tuesday, October 12, 1999 10:59 PM
<snip>
Ply Time Nodes Eval Principal Variation
=======================================================================
08/01|00:00:01| 157080| +308| Bxe5 Rxe5 Kf4 Rd5 Rh7 Rd4+ Kxf5 Rd5+
08/02|00:00:03| 461722| +318| Kf3 Bxf4 Kxf4 Kf8 Rf7+ Ke8 Rh7 Rd4+
09/01|00:00:04| 636169| +333| Kf3 Bxf4 Kxf4 Rd4+ Ke5 Rc4 Kf6 Rc6+
10/01|00:00:06| 1108849| +328| Kf3 Bxf4 Kxf4 Rd4+ Ke5 Rc4 Kxf5 Rc1
10/02|00:00:10| 1854018| +335| Bxe5 Rxe5 Kf4 Re4+ Kxf5 Rh4 b5 Rh2
11/01|00:00:20| 4103656| +336| Bxe5 Rxe5 Kf4 Re4+ Kxf5 Rh4 b5 Rb4
12/01|00:01:00| 12383720| +344| Bxe5 Rxe5 Kf4 Re4+ Kxf5 Rh4 b5 Rh2
12/02|00:01:38| 19932578| +413| Kf3 Bxf4 Kxf4 Rd1 Rh7 Rf1+ Ke5 f4 Rxh6
13/01|00:02:51| 34237797| +419| Kf3 Bxf4 Kxf4 Kf8 Rh7 Rb5 Rxh6 Kg7 Rh7+
14/01|00:06:43| 81512225| +418| Kf3 Bxf4 Kxf4 Rd4+ Ke5 Rc4 Kf6 Rc6+ Kxf5
15/01|00:21:03| 253149373| +424| Kf3 Bxf4 Kxf4 Rd4+ Ke5 Rc4 Kf6 Rc6+ Kxf5
16/01|00:53:09| 636275675| +424| Kf3 Bxf4 Kxf4 Rd4+ Ke5 Rc4 Kf6 Rc6+ Kxf5
17/01|02:50:28| 2034879866| +425| Kf3 Bxf4 Kxf4 Rd4+ Kxf5 Rh4 b5 Rb4 b6 Rb2
18/01|11:29:17| 8292853477| +424| Kf3 Bxf4 Kxf4 Rd4+ Kxf5 Rh4 b5 Rb4 b6 Rb2
Rh7 Rxb6 Rxh6 Rb5+ Ke4 Rb4+
Kd5 Rb7 Kd4 Rb6 Rh7 Rb4+ Ke5
Thursday, October 14, 1999 10:03 PM
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