Author: Les Fernandez
Date: 21:13:49 12/30/02
Go up one level in this thread
On December 30, 2002 at 14:24:14, Heiner Marxen wrote: >On December 29, 2002 at 14:00:20, Les Fernandez wrote: > >>On December 29, 2002 at 08:24:22, Uri Blass wrote: >> >>>On December 29, 2002 at 08:11:13, John Lowe wrote: >>> >>>>On December 29, 2002 at 07:00:11, Uri Blass wrote: >>>> >>>>>On December 29, 2002 at 00:26:50, Les Fernandez wrote: >>>>> >>>>>>[D]4k3/8/8/8/8/2P5/1PPP4/4K3 w - - >>>>>> >>>>>>The above pawn structure to the best of my knowledge can't ever be reached since >>>>>>the c3 pawn would have had to come from either b2-c2-d2. Are there alot of >>>>>>these type of positions or are there a handful of pawn structures that we know >>>>>>can't happen? >>>>> >>>>>I do not understand your question because I do not know what you mean by a lot. >>>>> >>>>>There are other pawn structures that cannot happen >>>>>[D]8/8/8/8/8/P7/PPk5/K7 w - - 0 1 >>>>> >>>>>Doy you ask for the number or the relative number of illegal pawn structures? >>>>> >>>>>Uri >>>>Hi Uri >>>> >>>>I wonder if the algorithm for spotting illegal pawn structures is complex or >>>>only fairly simple.........? >>> >>>It may be possible to do a simple algorithm to spot part of the illegal pawn >>>structures but i believe that an algorithm to spot all of them may be complex. >>> >>>Uri >>>> >>>>Illegal pawn structues don't happen in real games - human or computer so another >>>>question is "could the identification of an illegal pawn structure _ever_ be >>>>relevant in chess programming?" >>>> >>>>I don't think so..........you? >>> >>>I agree. >>>I do not see how identification of an illegal pawn structure can be relevant for >>>chess programs. >> >>Hello Uri, >> >>Well it may not be as relevant in chess progrmas but the work I am doing makes >>it very relevant since I am generating chess positions with pawns for which I >>need to know is a correct position or not. > >The ultimate answer to this is a "proof game", a legal game that yields >the position in question. While some pawn structures are relatively easy >to prove illegal (counting necessary captures and opponent pieces), >this can become very complex. Construction of proof games is part of >retro-analysis, and AFAIK, not at all easy in the general case. Hi Heiner, Yes I agree not at all easy!! As I mentioned in a prior post today I think after reading about all these various pawn formations I am going to forget about incorporating pawns in a utility I am working on until much more info is available on the subject. Les > >Cheers, >Heiner > >>Les >> >>> >>>Uri
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