Author: Robert Hyatt
Date: 05:40:11 04/20/05
Go up one level in this thread
On April 20, 2005 at 01:57:21, Jeremiah Penery wrote: >On April 19, 2005 at 21:44:53, Les Fernandez wrote: > >>On April 19, 2005 at 21:20:27, Jeremiah Penery wrote: >> >>>On April 19, 2005 at 01:43:24, Les Fernandez wrote: >>> >>>>On April 19, 2005 at 00:41:36, Les Fernandez wrote: >>>> >>>>>On April 18, 2005 at 22:39:01, Robert Hyatt wrote: >>>>> >>>>>>On April 18, 2005 at 16:43:58, Les Fernandez wrote: >>>>>> >>>>>>>Can someone explain to me the differences in the following outputs by Crafty. >>>>>>>These are some of the scenarios I came across. >>>>>>> >>>>>>>ce 1; pv; >>>>>>>ce 0; pv; >>>>>>>pv; >>>>>>>ce 0; >>>>>>>ce 1; >>>>>>> >>>>>>>Thanks, >>>>>>> >>>>>>>Les >>>>>> >>>>>>I don't know what that is. the ce 1 usually means that one side is material >>>>>>ahead, but the position is dead drawn. ce 0 usually means equal material >>>>>>draw... >>>>> >>>>>Hi Bob, >>>>> >>>>>Maybe I will post one position for each of the above outputs to see if you can >>>>>qualify it Tuesday evening. Thanks for your input. >>>>> >>>>>Les >>>> >>>>Decided to get them posted tonight <S> >>>> >>>>Here they are (actual output) >>>> >>>>k1K5/8/8/1R6/8/8/8/8 b - - acd 1; acn 1; acs 1; ce 0; pv Ka7; >>>>k1K5/6R1/8/8/8/8/8/8 b - - acd 1; acn 1; acs 1; ce 1; pv; >>>>k1K5/8/8/8/8/8/8/R7 b - - acd 1; acn 1; acs 1; ce -32767; pv; > >Ok, I looked more closely at these positions. The second position has no legal >moves, so it's a stalemate with no possible PV. I don't know why the ce would >be 1, however. In the third position, black is already mated, so has no legal >moves. I'm looking through the source (I assume you're using Crafty compiled >with the EPD support) to try and figure out why the first position isn't being >analyzed properly (I get the same output as you did on my machine). I responded to this yesterday, but somehow it didn't make it due to some sort of network glitch I apparently overlooked. Remember that crafty scores actual draws at -1, 0 and +1. +1 means that the position is a dead draw, but white is ahead in material. This is an artifact of "swindle mode" since given the choice of a draw with material down, or a draw with material up, I want to be material up hoping my opponent will make a mistake if he doesn't have endgame tables... so the ce 1 just means that white is up material, in a dead drawn position.
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