[Retros] Last move economy record

[Alain BROBECKER]

Hello,

I'm currently solving the "last move records", i found on the
excellent janko.retro website, and as a beginner i enjoy them
very much though slowly (at the moment only 46/59 of type A are solved,
with alas 3 errors).

But i have some comments/questions...

1.Is there a mistake in Q-, 8/8/8/8/8/4PPPk/3PPprb/5KQ1?
========================================================
The problem is:

Luigi Ceriani, ?
4|........
3|....PPPk
2|...PPprb      Q-  11/111  
1|.....KQ.      8/8/8/8/8/4PPPk/3PPprb/5KQ1
 +--------
  abcdefgh
7+4: Last move?

The retro play seems to go like:  n.Qh1-g1 n-1...Bg1xNh2
n-1.Ng4x?h2 but whatever ? stands for, Black is retro
stalemated????? Does the problem contains an error, or
does my reasoning do?

A quick way to solve this problem(?) is to modify the diagram to:

4|........
3|....PPPk
2|...PPprr      Q-  11/120
1|.....K.Q      8/8/8/8/8/4PPPk/3PPprr/5K1Q
 +--------
  abcdefgh
7+4: Last move?

With last move n.Qg1-h1 relasing a square for the black R,
and one possible retro play  n-1...Rh1xNh2 n-1.Ng4-h2
n-2...Kh4-h3 n-2.h2x?g3+ etc...

2.Where is the 14th A+B position?
=================================
The html file says:
"Of these 178 positions two are identical for type A, B and C
(KxQ and PxQ=N); and 14 are identical for type A and B."
I used a spreadsheet (works) and it gave the following identical positions:
BxB, BxP, NxB, NxN, NxP, PxB, PxP, PxR, QxB, QxQ, QxR, RxQ, RxR which makes 
only 13 identical positions. Also due to the lower/uppercase problem it
assumed the following where identical:
  3BRK1k/2p1pp1p/8/8/8/8/8/8  A08/011  PxN=R  Fabel, Karl 
  3Brk1K/2p1pp1p/8/8/8/8/8/8  A08/011  P-=B   Rapke, V. 
Is this the (wrong) 14th position or did i made a mistake. Maybe it would
be nice to list them in the .html, though it's likely to change one day
or another.

 

Thanks in advance, 
Sincerely, Alain Brobecker

  






Alain Brobecker (abrobecker at yahoo.com) |_  _  _ |_
http://abrobecker.free.fr/             |_)(_|(_|| ) of  Arm's Tech


 
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