Author: Robert Hyatt
Date: 07:40:38 05/31/00
Go up one level in this thread
On May 31, 2000 at 09:24:07, Aaron Tay wrote: >On May 30, 2000 at 17:46:51, Robert Hyatt wrote: > >>On May 30, 2000 at 14:01:39, Aaron Tay wrote: >> >>>On May 30, 2000 at 10:25:45, Robert Hyatt wrote: >>> >>>>On May 30, 2000 at 06:55:59, Ray MacFadyen wrote: > > >>There are under-promotion issues that can make you look silly. If you don't >>have kqrkr, then you won't know it is a mate. Most programs will then dance >>around and leave the pawn on the 7th, because it is a mate sitting there, but >>an unknown after it promotes. > >Okay . Thank you for explaining, however one for question please. > >If in a krpkp situation, would a Kqrkr TB be sufficent? Would it be then >considered a unknown if I don't have say KqnKr? In other words unpromotion is >usually rare and mostly unnecessay.. It is "usually" rare and unnecessary. But _not_ always. I have seen cases where =R was necessary (in real games) to avoid a stalemate. > > > >>Crafty can handle this case correctly, but most >>programs cannot. > >That was my mistake. I tried them all out only on Crafty. (Those I use many >others) . In fact , I remember trying out a KrpKP situation and i remember >thinking that it was quite unusual for Crafty to suddenly drop into analysing >mode after queening the pawn..But it was no problem so i assumed the rest >wouldn't have as well. > > it has special code for handling this case. Others will eventually do the same. However, you can buy 40 gigs of disk for 200 bucks, so having all the databases is not unrealistic. >>And if you are going to be using any program other than >>Crafty, then you ought to have all the tablebases in a "set" to avoid such >>problems... > >You are right. I have read many posts claiming that Crafty handles TBs better >than any program even the commericals..Should have remembered this fact.. > > >>Don't forget the promotion problem. You don't want to have your program draw >>in a totally won position, because it would not promote. > >I see now why some obviously winning position like KQRKQ or KQNKN might be >necessary but doesn't that mean that all Q endgames become important? For >example , I have a KPPKB , KPPKN set..So some engines then will have problems >because i don't have say KqpKn? or KqpKb? yep... they will refuse to promote until (maybe) they have to avoid a draw by 50 move rule.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.