Author: Oliver Roese
Date: 23:26:47 10/18/00
Go up one level in this thread
On October 19, 2000 at 01:06:03, Uri Blass wrote: >On October 19, 2000 at 00:51:19, Christophe Theron wrote: > >>On October 18, 2000 at 16:31:54, Ricardo Gibert wrote: >> >>>On October 18, 2000 at 15:57:10, Uri Blass wrote: >>> >>>>On October 18, 2000 at 15:52:09, Ricardo Gibert wrote: >>>> >>>>>On October 18, 2000 at 14:14:20, Uri Blass wrote: >>>>> >>>>>>On October 18, 2000 at 12:34:42, Ricardo Gibert wrote: >>>>>> >>>>>><snipped> >>>>>>>The algorithm to determine whether this type of position is drawn is quite >>>>>>>simple. With the h-pawn, Black draws if the K can get into the four corner >>>>>>>squares g7,g8,h7,h8. Otherwise, the outcome is not assured. Note, it is not >>>>>>>enough for the King to get in front of the pawn as the following position >>>>>>>illustrates: >>>>>> >>>>>>I can give another rule: >>>>>>Blacks draw if it is black to move and the distance between the black king and >>>>>>the corner in king moves is smaller than the ditance between the corner and the >>>>>>white pieces except the bishop(white king in king moves and white pawn in pawn >>>>>>moves) >>>>>> >>>>>>If it is white to move then use distance-1 instead of distance for white. >>>>>> >>>>>>Uri >>>>> >>>>>I like your rule. It's interesting, but it needs to be amended somewhat: >>>>> >>>>>[D]4B3/8/8/8/8/2k5/7P/K7 b - - 0 0 >>>> >>>>This position is not a draw by my rule. >>>>The distance of the white pawn to the corner in pawn moves is equal(and not >>>>smaller) to the distance of the black king to the corner in king moves. >>> >>>Yep, I goofed. >>> >>>> >>>>> >>>>>as you can see, your rule is a little dangerous. There may be other examples, >>>>>but this is what I came up with in a about a minute. Still your rule is >>>>>promising. >>>>> >>>>>There are some positions your rule does not give as drawn, but "my" rule does. >>>>>The reverse is also true of course, so maybe the rules should be combined? >>>> >>>>I agree that the rules can be combined. >>>> >>>>Uri >> >> >> >>This discussion is very interesting. So what's the ultimate rule? >> >>I had to work on this recently in Chess Tiger (and Gambit Tiger of course), and >>I'm not sure my own rule is as good as yours. >> >>Waiting eagerly for the next post... >> >> >> >> Christophe > >The logic behind my rule is simple > >If black king is closer to the corner than the white king and the white pawn >nothing can stop it if it begins a trip to the corner. > >It can do the trip using squares that the bishop does not control and the other >pieces cannot see these squares. > >Uri Looks good. And is harp, since i have counterexamples if one of the constraints is relaxed by one. Oliver
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