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Subject: Re: Transposition Table and draw by repetition

Author: Rick Bischoff

Date: 08:30:25 08/21/04

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The first move searched at every ply is Rc8-- That allows black to queen safely,
hence the -300.  Just a coincedence in the move ordering.  If Re8 or Ra2 was the
first move searched, we wouldn't see the -300 at all.

>
>How are the values < -300 getting backed up with hash table off?  You have at
>least 0 at any depth.
>*****
>With the hash table off, I get a series of lines, albeit much slower:
>
>2 -355 157 Rc8 e1Q Rc7 Kd3
>2 0 434 Re8 e1Q Rxe1 Kxe1
>2 314 2182 Ra2 Kd1 Ra1 Kd2   <-- this is the drawing line
>4 -355 7305 Rc8 e1Q Rc7 Qh4 Kc5
>4 -345 12008 Rd8 e1Q Kc4 Kc2 Rd7
>4 0 15734 Re8 e1Q Rxe1 Kxe1
>4 314 68783 Ra2 Kd1 Ra1 Kd2 Ra2 Kd1 Ra1 Kd2  <-- here it is again
>6 -365 445654 Rc8 e1Q Rc7 Qh4 Kc5 Qg5 Kd6 Kd3
>6 -355 804284 Rd8 e1Q Rd7 Qh4 Kd5 Kc3 Ke6
>6 0 956026 Re8 e1Q Rxe1 Kxe1
>8 -375 29705128 Rc8 e1Q Rc7 Qh4 Kc5 Ke3 Kc6 Kd4 Rd7 Ke5 Kc5  <-- Start of a new
>search, which means the drawing line never became the PV, which means everything
>is working.. right?
>*****



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