[Retros] More Type DD improvements

[Andrew Buchanan]

A white pawn g3 was accidentally omitted from the last diagram of the
improved compositions. Corrected version is:

 

www.janko.at/Retros/d.php?ff=2K1kb2/qPppppp1/pp6/8/8/2P3P1/PPpPP1P1/5B2
(Buchanan)

 

(Thanks Henrik Juel)

 

All the best,

Andrew.

 

-----Original Message-----

From: Andrew Buchanan [ <mailto:andrew at anselan.com>
mailto:andrew at anselan.com]

Sent: 03 May 2014 22:13

To: 'The Retrograde Analysis Mailing List'

Subject: More Type DD improvements

 

Dear retro friends,

 

Eight problems to which the stipulation is:

"Last move? Duplex."

 

First, one of the three remaining unsolved cases is closed:

 
<http://www.janko.at/Retros/d.php?ff=n1QB4/n1rppp2/pkP5/qqp5/1BP5/PKp5/N1RPP
P2/N1qb4>
www.janko.at/Retros/d.php?ff=n1QB4/n1rppp2/pkP5/qqp5/1BP5/PKp5/N1RPPP2/N1qb4
(Buchanan)

 

The remaining two cases are QxR & QxQ. QxR should be doable, but I think QxQ
is quite a challenge.

 

Second, seven incremental improvements to existing records:

 
<http://www.janko.at/Retros/d.php?ff=1BBQN3/ppKRp1p1/3p1p2/8/8/1P1P4/P1PrkPP
1/2nqbb>
www.janko.at/Retros/d.php?ff=1BBQN3/ppKRp1p1/3p1p2/8/8/1P1P4/P1PrkPP1/2nqbb
(Buchanan, Osorio, Lois, Keym) 

 
<http://www.janko.at/Retros/d.php?ff=2brkBRB/1p1p1ppK/8/8/8/1P4PN/1P1PNPrr/3
bRBbN>
www.janko.at/Retros/d.php?ff=2brkBRB/1p1p1ppK/8/8/8/1P4PN/1P1PNPrr/3bRBbN
(Osorio, Lois, Keym, Buchanan) 

 
<http://www.janko.at/Retros/d.php?ff=8/5p1p/8/8/8/1P2P1P1/kPPPrP1P/N1KQqr1R>
www.janko.at/Retros/d.php?ff=8/5p1p/8/8/8/1P2P1P1/kPPPrP1P/N1KQqr1R (Osorio,
Lois, Buchanan)

 
<http://www.janko.at/Retros/d.php?ff=8/ppp1p2p/3p2p1/8/8/2PPPP2/1PpQqrP1/kBR
nnrbK>
www.janko.at/Retros/d.php?ff=8/ppp1p2p/3p2p1/8/8/2PPPP2/1PpQqrP1/kBRnnrbK
(Osorio, Lois, Buchanan)

 <http://www.janko.at/Retros/d.php?ff=8/8/8/8/1P6/kPPP4/r1brP3/BRKB4>
www.janko.at/Retros/d.php?ff=8/8/8/8/1P6/kPPP4/r1brP3/BRKB4 (Le Gleuher,
Buchanan) 

 
<http://www.janko.at/Retros/d.php?ff=5BNQ/4ppb1/5pkb/6p1/6P1/5PKB/4PPB1/5bnq
> www.janko.at/Retros/d.php?ff=5BNQ/4ppb1/5pkb/6p1/6P1/5PKB/4PPB1/5bnq
(Buchanan)

 
<http://www.janko.at/Retros/d.php?ff=2K1kb2/qPppppp1/pp6/8/8/2P5/PPpPP1P1/5B
2> www.janko.at/Retros/d.php?ff=2K1kb2/qPppppp1/pp6/8/8/2P5/PPpPP1P1/5B2
(Buchanan)

 

Also: to let you know, my PxR=Q was cooked by Andrey Frolkin. I have
submitted a fixed version to Hans Gruber for feenschach, so is not included
here.

 

All the best,

Andrew.

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