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Subject: Re: I think I found a terrible bug in Tiger

Author: James T. Walker

Date: 21:49:45 03/22/01

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On March 22, 2001 at 17:55:07, Derek Mauro wrote:

>I'm no expert on computer chess, but I thought I'd call this to everyone's
>attention.  I was analyzing one of my recent games with Tiger (reg. and gambit),
>and had a drawn position(I had black).
>
>[D]8/8/8/8/1n6/2K5/p7/6k1 w - - 0 111
>
>For some reason, in the obvious draw, Tiger gives it -12 and wants to play
>Kxb4?? even after like 20 minutes.  All the programs seem to think its about -6
>or so, but they all play the correct move, the obvious Kb2.  Is this a bug?
>(The 4 piece tablebases will easily solve this bug, but this position is so
>incredibly easy that I can't see why it would even need them.)
>
>This next position is also from the same game that all programs seem to have
>trouble with, but I don't believe this is a bug.
>
>[D]8/1k6/2n5/8/6r1/p1K5/7R/8 b - - 0 87
>
>Most programs want to play Nb4, but from there white can force a draw.  I think
>Ra4 is the correct move (Na5 might also work), but I'm not sure.  I also fell to
>the tempation of Nb4 during the game :(
>
>Derek

Hello Derek,
Can you post a line which gives white the draw after Nb4?  It seems to me that
black should still win this ending.  What am I missing?
Jim



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