[Retros] new Type DD problem + 3 improved problems

Andrew Buchanan andrew at anselan.com
Mon Mar 16 13:22:35 EDT 2015

Dear Retro friends.


Re: problem (4) QxR congratulations Andrey on getting there first, and apparently with a more economical problem. 10 months seems a long time to have a problem unpublished in this day and age.


Re: problem (2) Mario has pointed out that my improvement of my own which allowed me to remove 1 unit is cooked – my apologies. http://pdb.dieschwalbe.de/search.jsp?expression=PROBID=%27P1108734%27 is still the economy record.


But (1) & (3) are still in the ring.


All the best,



From: Retros [mailto:retros-bounces at janko.at] On Behalf Of afretro
Sent: 16 March 2015 18:49
To: The Retrograde Analysis Mailing List
Subject: Re: [Retros] new Type DD problem + 3 improved problems


Dear retro friends,

Last year Andrew wrote:

> The remaining two cases are QxR & QxQ. QxR should be doable, but I think QxQ 

> is quite a challenge.

After that, I composed the two missing records and sent the positions on May 18, 2014, to Thomas Brand for publication in feenschach.

QxR: 14+13 pieces.

QxQ: 15+10 pieces.

As far as I know, they haven’t been published yet.




16.03.2015, 12:10, "Andrew Buchanan" <andrew at anselan.com>:

Dear retro friends,

Here are four easy "Type DD" problems. I.e. they all have the stipulation
"Last move? Duplex" and the last move turns out to be the same kind for
White as for Black.

First the improvements:

(1) Quick fix to remove 3 units:
(4+9) Last move? Duplex
version of Mario Richter

(2) Quick fix to remove 1 unit:
(8+7) Last move? Duplex

(3) New approach:
(12+8) Last move? Duplex

And a new one:

(4) One of the two outstanding tasks:
(14+15) Last move? Duplex

This is the 56th DD record, leaving us just one outstanding DD task (apart
from castlings & en passant, which seem impossible), namely: QxQ.

All the best,

Retros mailing list
Retros at janko.at

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