Author: Christophe Theron
Date: 15:01:38 03/15/99
Go up one level in this thread
On March 14, 1999 at 10:24:26, blass uri wrote:
>R4b1q/5Pp1/Pk4Pp/3K3P/7P/8/8/8 w - - 0 1
>
>white wins by 1.a7
>Genius3 finds it in less than 1 second
>
>unfortunately some engines for Fritz5 cannot solve it(crafty16.5's move is Ke6
>and the evaluation is 0.00 at depth 19,exchess2.51's move is Ke6 and the
>evaluation is 0.00 at depth 14 )
>
>I understand that after 1.a7 Kb7 2.Re8 Kxa7 3.Kc6 white has no threat.
>
>Is it the reason that these engines cannot solve it?
>
>Do they use null move with an infinite R so they do not analyze at all even to
>reduced depth moves with no threat?
>
>Fritz5(16 bit) surprises and solves this position but only at depth 14.
>The move is Ke6 at the beginning of iteration 14 with the strange evaluation
>-0.47.
>
>Suddenly fritz5(16 bit) sees Kc4 with evaluation -0.44.
>The evaluation jumps to 8.xx
>
>Kc4 is winning and fritz saw winning evaluation so I can say that Fritz can
>solve it.
>
>Fritz5(16 bit) at depth 15 changes its mind to the simpler winning move 1.a7
>
>Junior5 has no problem to solve the position because it is not a null mover.
>
>Uri
Tiger in its normal mode plays this move in 0.50 second on K6-2 300MHz, 8Mb
hash.
Christophe
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