[Retros] Retro composing tourney

[Pascal Wassong]

Hello,

I checked some of the Kamikaze problems in the PDB (thank you Alain for
showing us how to search them), and I don't understand some solutions.

P0007627 by Günter Lauinger has solution Ng5-h7, but if kings can be in
contact, the last white move could have been Kf7-g8, so there are
several last moves possible.  The stipulation of this problem is Rex
Inclusiv.

P0007638 by Günter Lauinger has solution Rg1xNf1+, but why does Kg1-g2+
not work as the last move ?

What am I missing ?

The condition does not allow pawns to change column, so it seems
impossible to build a nice retrocage.

Happy composing,
Pascal


Bernd Gräfrath <retromode at web.de> writes:

> Dear retro-friends,
>
> the PDB is, of course, not complete. In his book "Der Blick zurück", Wolfgang
> Dittmann mentions a thematic tourney of "feenschach", organized by Günter
> Lauinger and asking for "Last move?"-compositions with Kamikaze Chess. On
> page 193 WD mentions the following sources: feenschach no. 48
> (October-December 1979), pp. 240-244; feenschach no. 50 (April-June 1980),
> pp. 375-380 (with the award). However, I do not have these issues of
> feenschach.
> In "Der Blick zurück", some of WD's own "Last move?"-compositions with
> Kamikaze Chess can be found on pp. 271-275.
>
> Best wishes,
>
> Bernd
>
> Gesendet: Samstag, 11. Juli 2020 um 09:44 Uhr
> Von: "Alain BROBECKER via Retros" <retros at janko.at>
> An: "retro" <retros at janko.at>
> Cc: "Alain BROBECKER" <abrobecker at yahoo.com>
> Betreff: [Retros] Retro composing tourney
> Dear Retro friends,
>
> You can find the tourney announcement here:
> http://abrobecker.free.fr/R2020.pdf
> http://www.phenix-echecs.fr/Messigny/AFCE.php
>
> Compose a classical retrograde analysis problem (last move(s), legal position,
> captures...) with the Kamikaze Rex Inclusive condition (B.G. Laws, 1928): A
> piece making a capture is removed from the board together with the captured
> man. No other fairy condition, no Proof Games, Illegal Clusters or Retractors.
>
> Some remarks on the condition:
> • The number of white pieces will always be the same as the number of black
> pieces.
> • A king cannot defend himself by capturing the attacking piece.
> • The two kings can stand on adjacents squares.
>
> Only one problem per external composer (send to abrobecker at yahoo.com
> before monday 13/07 at 15:00 (UTC+2)). Please send if possible the Forsyth
> notation of the position as well as a detailled solution.
>
> Happy composing,
> Alain
>
> PS: On the PDB, you can see more example KRI problems by typing the
> following (sadly WPIECES=BPIECES was not working):
>
> G='retro' AND K='Kamikaze' AND (
> (WPIECES=1 AND BPIECES=1)
> OR (WPIECES=2 AND BPIECES=2)
> OR (WPIECES=3 AND BPIECES=3)
> OR (WPIECES=4 AND BPIECES=4)
> OR (WPIECES=5 AND BPIECES=5)
> OR (WPIECES=6 AND BPIECES=6)
> OR (WPIECES=7 AND BPIECES=7)
> OR (WPIECES=8 AND BPIECES=8)
> OR (WPIECES=9 AND BPIECES=9)
> OR (WPIECES=10 AND BPIECES=10)
> OR (WPIECES=11 AND BPIECES=11)
> OR (WPIECES=12 AND BPIECES=12)
> OR (WPIECES=13 AND BPIECES=13)
> OR (WPIECES=14 AND BPIECES=14)
> OR (WPIECES=15 AND BPIECES=15)
> OR (WPIECES=16 AND BPIECES=16)
> )
>
> Alain Brobecker - http://abrobecker.free.fr/
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