Author: Bernhard Bauer
Date: 00:09:38 11/11/99
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On November 10, 1999 at 11:36:09, Ricardo Gibert wrote: >On November 09, 1999 at 22:04:30, Bruce Moreland wrote: > >>On November 09, 1999 at 18:42:24, Andrew Dados wrote: >> >>>Hello, Scott! >>> Bad news here: 2 Knignts can not mate lone King... You may have found some >>>positions where 2 N mate King+Pawn; not sure what is longest mate there, but >>>there are (KNN vs KP) positions where definetely more then 50 moves without >>>progress (moving a pawn or capture) is needed. As I remember fide adjusted 50 >>>move rule for this case (and some others) and allows now 150 moves with no >>>progress for KNN vs KP (correct me if I am wrong here). >>> >>>-Andrew- >> >>Black king h8, white king h6, white knight f6, white knight h4. White to move >>mates in one with Ng6#. >> >>It is not a forced mate, because black's previous move must have been Kg8-h8. >>He simply could have played Kg8-f8 or Kg8-f7 and avoided the mate. >> >>bruce > >A final position where 2 Ns mate a king _can_ be forced (by transposing KNNK via >a series of exchanges). I have a recollection of an endgame study by Troitzky >that ends this way. There also endgame studies where the final position has K+B >mating K+B, etc. There is a possible bug with many programs that declare such >endings as draws when a mate in one may still be possible. I believe that Fritz4 >is one program that behaves erratically when cofronted by such examples. There >are no mate in twos with just KNNK that can be forced of course. Would you be so kind and post those positions? I would appreciate to have a look at them. Kind regards Bernhard
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