Author: Uri Blass
Date: 22:29:35 06/14/02
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On June 15, 2002 at 00:44:19, John Merlino wrote: >On June 14, 2002 at 21:24:02, Slater Wold wrote: > >I'm a little confused by this one.... > >>Analysis by Shredder Paderborn: >... >>1.g7 f2 2.Be7 f1R 3.gxh8Q+ Kxh8 4.e6 Kg8 5.Kd7 Rd1 6.Bd6 Rxd3 7.e7 Rf3 8.e8Q+ >>Rf8 9.Qxf8# >> ± (1.28) Depth: 14/26 00:00:02 733kN, tb=935 > >How does a PV that ends in checkmate get an eval of only 1.28??? > >jm I know this behvaiour from some engines(I remember Junior and Crafty) The reason for this behaviour is that the engine does not know that Qxf8 is a checkmate when it evaluates it but when the gui reads the pv it calculates and find it. I believe that it is not a good decision not to have checkmate detection in the evaluation function espacially for engines that use most of their time in their evaluation(and shredder is considered to be a slow searcher). It cannot happen to Movei. Movei is using the number of legal moves as part of it's evaluation and in the case that it is 0 and the king is in check Movei knows that it is a checkmate. Uri
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