Author: Robert Hyatt
Date: 09:17:24 03/14/99
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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 this is simply one of the many null-move killer positions. Nothing much to do about it either...
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