Author: Richard A. Fowell (fowell@netcom.com)
Date: 00:29:14 12/05/98
Go up one level in this thread
On December 02, 1998 at 11:35:12, Robert Ericsson wrote:
>This a missing post that seems to have disappeared since yesterday...
>
>/Robert Ericsson
>---------------------------------------
>I had the following position in a correspondence chess game some three
>years ago.
>
>5b1r/3bkp2/3ppp2/p6P/4PP2/1PNB4/1KP5/7R b - -
>
>White's last move was 1. Kb1-b2 (1. f5 is better) and after 1. - f5!
>2. exf5 Bg7 3. fxe6 fxe6 4. Be2 Rc8 5. Rh3 Rxc3! 6. Rxc3 Bd4!
>black won easily within 10-15 more moves.
>
>I have tested this position on both Hiarcs 6 and Rebel 9 and they seem to
>understand nothing about this position. They don't find 1. - f5 because
>they obviously don't see the deadly pin long the diagonal. And even after
>6. - Bd4 it will take a long time for them to realize that white is actually
>lost.
>
>My questions are: when (at which PLY) do chess engines realize that:
>a) 1. Kb2-b2 is bad due to the reply 1. - f5!
>b) white is lost after 6. - Bd4
>
>Robert Ericsson
>----------------------------------------
MacChess 5.0b5 ( a "fast searcher" style program)
a) Finds and sticks with 1. ... f5! at 13 ply (42 min on my 180MHz 604e)
b) Thinks White shouldn't play 3. fxe6 after looking at the original
position at 15 ply (2hr16 min).
Here's the log file:
MacChess 5.0b5 - Macintosh 7300/180 (180MHz 604e )
02/01|00:00:00| 90| -56| Bc6 Bc4
03/01|00:00:00| 437| -54| Bc6 Bc4 Bg7
04/01|00:00:00| 3140| -61| Bc6 Bb5 Bb7 Bc4
04/12|00:00:00| 5412| -58| Bh6 f5 Bc6 Rh2
05/01|00:00:00| 11301| -56| Bh6 f5 Bc6 Bb5 Bb7
05/04|00:00:00| 33527| -54| Bg7 f5 Bc6 Bb5 Bb7
06/01|00:00:00| 96399| -55| Bg7 f5 Bc6 Rh4 e5 Bc4
07/01|00:00:01| 185900| -55| Bg7 f5 Bc6 Bc4 exf5 Nd5+ Bxd5 exd5
08/01|00:00:03| 482019| -60| Bg7 f5 Bc6 Bb5 Bb7 Rh4 e5 Bc4
08/02|00:00:03| 572418| -56| Bh6 Rh4 Bc6 Bb5 Bb7 Bc4 Bc6 Bd3
09/01|00:00:05| 842488| -54| Bh6 Rh4 Bc6 Bb5 Bb7 Bc4 Rg8 f5 Be3
10/01|00:00:11| 1844421| -55| Bh6 Rh4 Bc6 Bb5 Ba8 f5 Be3 Rh3 Bd4 Bd3
11/01|00:00:24| 3386296| -54| Bh6 Rh4 Bc6 Bb5 Ba8 Bc4 Rg8 f5 Bg5 Rh3 Bf4
12/01|00:04:38| 28910086| -54| Bh6 Rh4 Bc6 Bb5 Bb7 Bc4 Rg8 Ka3 Bc6 f5 Bg5
Rh3
13/01|00:25:30| 153203047| -52| Bh6 Rh4 Rc8 Ne2 e5 f5 Bc6 Nc3 Bd2 Ba6 Rc7
Bc4 Be3
13/06|00:42:11| 287195041| -48| f5 exf5 Bg7 fxe6 Bxe6 f5 Rc8 fxe6 Bxc3+
Kc1 fxe6 h6 e5 h7 Rh8 Rh5 d5 Bf5
14/01|01:07:30| 572859039| -42| f5 exf5 Bg7 fxe6 fxe6 Rh3 Bd4 h6 e5 f5 Kf6
h7 Kg5 Be4 Bxf5 Rg3+ Bg4 Bf3 Kf4
Rxg4+ Kxf3
15/01|02:16:04| 1342525736| -35| f5 exf5 Bg7 Be2 a4 Rh3 axb3 cxb3 exf5 Bc4
Be6 Kc2 Kd7 Kd3 Kc6 b4 d5
16/01|04:47:36| 3050180996| -29| f5 exf5 Bg7 Be2 a4 Rh3 axb3 cxb3 exf5 Bc4
Be6 Kc2 Bh6 Rh4 Rg8 Be2 d5 Bd3
17/01|13:57:49| 9234998273| -24| f5 exf5 Bg7 Be2 a4 Rh3 axb3 cxb3 exf5 Kc2
Be6 b4 d5 Nb5 Bh6 Rh4 Bg7 Kd3 Bf6
Richard A. Fowell (fowell@netcom.com)
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