# [Retros] Minimal Deviation from the Rules (MDR) - castling and e.p. cases

raosorio at fibertel.com.ar raosorio at fibertel.com.ar
Wed Feb 6 17:22:51 EST 2008

Hi Guus and everybody,

"When you think about it, the whole concept is quite similar to MDR but projected in the domain of typographic and pictographic errors"

Yes, it is. The MDR convention is an effort to provide an scenario where all the things might be
quite subltle. There is a remarkable potential here (I think that the Ke1-g1 problem is a good
example. Ke1-g1 is a geometrically correct move due to the h1 rook. Without this, this king evolution
would not fit with any geometry alllowed by article 3).

Look at this Werner's problem,

Werner Keym
Die Welt 1969 (VI) Die Schwalbe 8 04/1971
1B6/8/4PPPP/4p2P/5k1P/3Q3P/8/6KR
#0,5

the position contains a very nice retroanalysis, but the stip #0.5 makes the solution evident.
MDR provides the following alternative presentation: (How does this end? MDR).

Both theses cases belong to the "finalyzed and incomplete move" cathegory.
After the 7.4 retraction article 4.6 forces to make the complete move (and then to mate).

Best,
Roberto

Thanks Roberto, I will look at the position. For years I have enjoyed solving the Christmas puzzle in one of our newspapers, for the main reason that there is always one error in it, two in the very good years. Nothing exceeds the satisfaction of finding the errors plus the solutions! Also, this will be last fortress to fall to the computer, a million years from now. One year ago I suggested to the belgium team captain to organize a solving contest based on the intentional error idea. I mentioned options like "omitting a pawn in the diagram", "changing draw to win in the stipulation", "mistyping helpmate for selfmate" (this one I encountered in a recent puzzle) - possibly in a mix with some correct presentations as well. For the requirement to be in special state of mind to solve these problems, I suggest the name "wodka solving contest" for such a competition. When you think about it, the whole concept is quite similar to MDR but projected in the domain of typographic and p
ictographic errors.

Guus Rol.