Computer Chess Club Archives


Search

Terms

Messages

Subject: Re: This position killed Comet

Author: Robert Hyatt

Date: 06:31:46 02/16/01

Go up one level in this thread


On February 15, 2001 at 23:45:56, Pete Galati wrote:

>On February 15, 2001 at 23:05:58, Robert Hyatt wrote:
>
>>On February 15, 2001 at 15:01:41, Pete Galati wrote:
>>
>>>On February 15, 2001 at 06:10:16, leonid wrote:
>>>
>>>>Hi!
>>>>
>>>>If you like solve one forced mate, you can try this:
>>>>
>>>>[D]3BQnQN/3b3q/2Q3rn/KR2Qqbk/1R2Qqrn/2Q4b/3b1n1q/1Q1BQ1QN w - -
>>>>
>>>>Please, indicate your result.
>>>>
>>>>If you could bring one position of forced mate found during the chess
>>>>chapionship (human player) it will be very appreciated.
>>>>
>>>>Thanks,
>>>>Leonid.
>>>
>>>I tried this position in Crafty first, because it somehow looked like it might
>>>not work, and as soon as I entered the "analyze" command, it crashed Crafty, so
>>>I figured it probably wouldn't work in a Chessbase gui either.
>>
>>
>>
>>I ran this position with no problems.  It has 114 moves at the root so it is
>>hellishly slow to try, but it didn't "crash".  1 ply took 1.24 seconds,  2 plies
>>took 1:10 which is amazing.  I let it run for another 30 minutes without a
>>crash of any kind.
>>
>>What happened when you say "it crashed"???
>
>I got this message that reads: "Crafty has cause an error in <unknown> Crafty
>will now close.  If you continue to experience problems, try restarting your
>computer"
>
>That was just from pasting it in, not from the Analyze command.
>
>But since you asked about it, I took a close look at the message and said
>"that's the damn Windows, not Crafty!"  So instead of pasting it into the Dos
>box, I pasted it into a file, and loaded it with "epdlrec", I always have to
>look that thing up cause I never remember that command, and now it's analyzing
>the position just fine.  Thanks.
>
>It's not real thrilled with it though, it's not getting very far yet (but I am
>using the browser too.
>
>Pete
>
>     clearing hash tables
>     time surplus   0.00  time limit 30.00 (3:30) [easy move]
>nss  depth   time  score   variation (1)
>       1     0.68  35.30   1. Qxh2 Nxe4 2. Qxh7 Nxc3 3. Qexf5
>                           Nxb1 4. Qhxf4 Nxf5 5. Bxg4+ Bxg4
>       1->   1.25  35.30   1. Qxh2 Nxe4 2. Qxh7 Nxc3 3. Qexf5
>                           Nxb1 4. Qhxf4 Nxf5 5. Bxg4+ Bxg4
>       2     1.47  35.30   1. Qxh2 Nxe4 2. Bxg4+ Nxg4
>       2->   1:05  35.30   1. Qxh2 Nxe4 2. Bxg4+ Nxg4
>       3     1:07  35.30   1. Qxh2 Nxe4 2. Bxg4+ Nxg4
>       3->   2:43  35.30   1. Qxh2 Nxe4 2. Bxg4+ Nxg4
>       4     2:55  35.30   1. Qxh2 Nxe4 2. Bxg4+ Nxg4 3. Qxh7+
>                           Nxh7
>       4     5:27     ++   1. Nxg6!!


This is not unexpected.  If you type "?" and get the output, this is
triggering extensions like mad, particularly the check and one-legal-reply
extensions.  And the average real branching factor is well over 100 for
any position where the side on move is not in check.  When it is in check,
the branching factor is very high in many positions due to the dozens of
valid interpositions.

Messy position.

:)



This page took 0 seconds to execute

Last modified: Thu, 15 Apr 21 08:11:13 -0700

Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.