Author: Uri Blass
Date: 01:07:38 12/25/03
Go up one level in this thread
On December 25, 2003 at 03:27:02, Mike S. wrote: >On December 24, 2003 at 21:41:09, Rolf Tueschen wrote: > >>>>>>(...) > >>NOPE Mike! That a 3-fold, once you notice it, is a draw, this is NOT something >>special for computerchess, but for human chess and from there it was taken to >>computerchess. > >You certainly know (?) that a 3-fold is *not* automatically a draw once one >notices it, but *only when claimed* It doesn't have to be a draw. The same goes >for the 50 move rule. The only "must" draw like that is stalemate :-) > >When I'm (otherwise) *winning*, i.e. a rook up etc., and my opponent forces a >perpetual, I won't claim a draw of course. Still, I may take notice of it. But >it makes no sense to claim. Also, I *don't have to claim* (of course independent >from who's better). If the opponent misses it - his business. That's how it >actually really is in chess in general (I don't quite know what else you are >talking about). > >I guess you may assume, all computerchess programs would be so foolish to claim >the draw against themselves then in a situation like above, but that's not true >either. No I do not think that chess programs are foolish by claiming draw every time they can do it based on a 3 time repetition. The point is that every 3 time repetition can be claimed by both sides. It is logical to assume that the opponent does not do some mistakes(otherwise programs will never resign). For chess programs I assume that the mistake of not claiming a draw by 3 time repetition is a mistake that they do not do. If I play against opponent that does not do the mistake of not claiming a draw by 3 time repetition then I can lose nothing by claiming a draw everytime that I can do it based on 3 time repetition because in that case the fact that the opponent did not claim a draw proves that it is good for me to claim a draw(or alternatively if it is my move and I consider if to claim a draw based on reptition after the move that I plan then I can be sure that if not claiming a draw is good for me the opponent will claim a draw immediately after my move). I do not care about the case when I play against an opponent that does the mistake of not claiming a draw by 3 time repetition because this opponent is a usually an human and the tournament is a computer tournament. I definetely know Nimzo 2000 (own GUI) doesn't claim such draws when 0.5 >would be lost by it so to speak. How can it lose 1/2 points by it? It only can lose it by a bug. A program with no stupid bugs cannot get into 3 time reptition from a winning position and if the original position is a draw then it does not lose 1/2 point by it but only lose some chance that the opponent will go wrong. I guess Fritz in serious rating game mode will >behave the same, but I didn't test that. Fritz in a serious rating mode will not get into a 3 time repetition from a winning position if it has no serious bugs. Uri
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