Author: Zheng Zhixian
Date: 23:17:42 12/03/05
Go up one level in this thread
On December 02, 2005 at 17:27:47, Günther Simon wrote: >On December 02, 2005 at 17:17:50, Robert Hyatt wrote: > >>On December 02, 2005 at 15:49:11, Paul Jacobean Sacral wrote: >> >>>On December 02, 2005 at 15:19:51, chandler yergin wrote: >>> >>>>On December 02, 2005 at 14:56:48, Uri Blass wrote: >>> >>>>>Engines can say mate in 14 even when there is mate in 11 but not the opposite. >>>>> >>>>>Engines should say mate in 11 for white only when they checked all defences of >>>>>black and found that there is no defence against mate in 11. >>> >>>>Engines evaluate all moves 1/2 move i.e. 1 Ply at a time. >>>>Nothing more.. nothing less. >>>>The deeper the search the better the evaluation. >>>>You assert bugs when there is none. >>> >>>Excuse me, but with replies like that people will start to think that you are a >>>troll. Please don't explain to Uri Blass how engines work: He has written an >>>engine himself. >>> >>>Call it bug, mistake, error or whatever you like: If the shortest possible mate >>>in a position is #14 and an engine displays #11, there is something wrong. Maybe >>>a rare effect of nullmove pruning or something like that... but #11 is simply >>>wrong and not a "better evaluation!" :) >>> >>>Yours truly Paul J. Sacral >> >> >>That is completely correct. If an engine claims a shorter mate, and it is >>proven the mate is longer than that, then the engine has a bug, pure and simple. >> The inverse is not true, since many engines will find a deeper mate and quite >>before finding the absolute shortest mate (some like Crafty won't do this except >>when EGTBs are involved) and this is not necessarily a bug, but an artifact of >>how the search is extended. >> >>I am not sure why this has become "disinformation central" all of a sudden... > >Bob, this is not 'all of a sudden'. It was always there in every post >from CY since ever and in times he writes 20+ posts a day it simply >looks like that over here... > >Guenther And that's only the beginning, he then moves the same question to CTF, where people like Bruce Moreland , Ulrich Tuerke have to say the same thing over AGAIN.
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