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Subject: Re: 2 test positions about king safety

Author: Robert Hyatt

Date: 08:28:41 09/01/99

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On September 01, 1999 at 04:55:34, blass uri wrote:

>r1b1k2r/1pqp1ppp/p1Nbp3/8/4P3/2N5/PPP2PPP/R1BQR1K1 b kq - 0 1
>avoid Bxh2+
>
>Junior5 solved this test againsy yudasin at tournament time control but could
>not solve it at faster time control
>


Here is my output for this.  Crafty doesn't think it is 'good' at all, but
does bounce between that move and dxc6/bxc6 as it searches.  By the 1:33
mark it has decided that this is getting bad enough that it discounts it
and changes for good at depth=13...

It finally (after finishing depth=13) settles on bxc6.  If it has a target
time of 94 seconds (or longer) it won't play Bxh2.  In looking at it, Bxh2
doesn't look horrible, since white has castled and black has not, although
I doubt I would play it myself.




>r2q1rk1/pb3ppp/2n5/1pbNP3/2p1Q3/P4N2/BP3PPP/R4RK1 w - - 0 1
>from Junior-nimzo(wccc)
>find Nf6+
>

This is a tactical shot that really has nothing to do with king safety.  Unless
you weigh king exposure _way_ high, which will find this move, but will also
find lots of sacrifices that are totally worthless.  Crafty will almost make
this move at any time control, but I have a scoring term that says _never_
sac a piece for 2-3 pawns, because of all the 'bad trades' I see other programs
make and lose as a result of.  I don't know that I want it to play this,
although it will expect it to be played against it and defend accordingly,since
I have some asymmetry...



>fixing a program to solve the second one may cause a failure in the first
>position.
>
>I am interested to know if tal can solve the first one
>A program with real knowledge about king safety should solve also the first
>position.
>
>Uri



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