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MatPlus.Net Forum Twomovers Pas de deux
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(1) Posted by Hauke Reddmann [Friday, Aug 25, 2017 13:02]; edited by Hauke Reddmann [17-08-25]

Pas de deux

Inspired by a MP posting ("Mirror Moves"), I quickly composed the
following 2#. (It's substandard but I only wanted to show the theme.)

(= 7+3 )

Only the thema variants (go find everything else alone, including solution :-) :
1.Sa8? Sa4!, 1.Se8? Se4!, 1.Sa6? Sxa6!, 1.Se6? Sxe6!

I also composed a lot of examples with parallel moving on the occasion
of Loshinsky's 100th, and will make a little article (maybe for his
111th? :-). I feel that this problem could be thrown in for good measure,
and obviously a third possibility (i.e. white and black pieces move in
the opposite direction) is still unresearched. Also note that in this
problem Black mimics White, while in the Loshinsky-inspired ones it's
the other way round.

So: Whoever wants to jump in here, will be included in the article.
Only thematic requirement:
1a Whites mate mimics Blacks defense or
1b Blacks parry mimics Whites try, and "mimic" is
2a Same vector or
2b Mirrored vector or
2c 180° Rotated vector
(or 2d free rotated vector, if your muse is a troll :-)
(This problem: 1b2b.)

Show *at least* 2 variants lest the solver will probably find it
artificial otherwise.

EDIT: In the article, only orthodox 2#. What you add here is
up to your fancy ;-)

(Read Only)pid=15930
(2) Posted by Hauke Reddmann [Saturday, Aug 26, 2017 13:29]

Have another one, composed on the fly during the (club) Lübeck
solving competition (you know me, I'm read in half the time :-)
Type: 1a2c.

(= 7+7 )

1.Sf6! (2.Th7) Be5/Be3 2.Bg3/Bg5
(Read Only)pid=15934
(3) Posted by Hauke Reddmann [Monday, Aug 28, 2017 22:36]

I don't know what keeps you from adding, I compose an example
in five minutes (it has to be just an example after all,
I don't want to take away a Loshinsky-like masterpiece from you :-)

(= 8+7 )

1.f8Q (Fleck) Qc3/Qc4/Qc5 2.Qf6/Qf5/Qf4

1a2c, illustrating mainly what you should NOT do, under any circumstances:
let concurrent parades like Qxb2 or Bc3 interfere with the solver
recognizing the intended theme.
(Read Only)pid=15955
(4) Posted by Michael McDowell [Tuesday, Aug 29, 2017 00:26]

A related idea:

Op de Hoogte 1913

(= 11+8 )

Mate in 2

1.Qh8 (>2.Qh4)
1...Rd3 2.Rf5
1...Re3 2.Rf4
1...Rxf3 2.Rxf3

(1...Rcb3 2.Rxc4
1...Sc5 2.Rd6
1...Sxg6 2.Qd8)
(Read Only)pid=15956
(5) Posted by Hauke Reddmann [Tuesday, Aug 29, 2017 10:45]; edited by Hauke Reddmann [17-08-29]

Neato. Falls under my description (EDIT: 1a2d, 90°) and will definitely be
included. (I personally avoid unrelated byplay and would
move everything "against the wall" to save a few pieces [8+8],
but that is stuff for endless discussion :-)
(Read Only)pid=15962
(6) Posted by Daniel Wirajaya [Tuesday, Sep 26, 2017 15:40]

Here is a simple one with three different motivations.

(= 5+3 )

Key: 1. Kxd7 [2. Bxh7#]
1... Bg6 2. Bf7#
1... Bf5+ 2. Be6#
1... Be4 2. Bd5#
(1... Bxg8 2. Rxg8)
(Read Only)pid=16052
(7) Posted by seetharaman kalyan [Tuesday, Sep 26, 2017 20:14]

I suppose that another variation can be easily added with a different (but inferior key
(Read Only)pid=16053
(8) Posted by Arpad Rusz [Tuesday, Sep 26, 2017 22:25]

A task featuring the theme 7 times using queens:
(Read Only)pid=16054
(9) Posted by Michael McDowell [Tuesday, Sep 26, 2017 22:26]

Four thematic variations in a nice mutate by Ahues, though with only two motivations.

Herbert Ahues
5th Prize, Chess 1956

(= 7+8 )

Mate in 2

Set 1...B~ 2.Rxg6

(Read Only)pid=16055
(10) Posted by Darko Šaljić [Wednesday, Sep 27, 2017 09:30]

2 Pr Probleemblad 1964
(= 10+11 )
(Read Only)pid=16056
(11) Posted by Hauke Reddmann [Wednesday, Sep 27, 2017 14:20]

THX for the additions. Obviously, there
is a ton of rook-rook-duels in the n# genre, and
"duel" in the 2# Albrecht database alone lists 580 entries.
Still much research to do :-) Random example:
(= 12+11 )

S. Shedej, Sportivna Gaseta 1990

@Arpad: I can't count the Bakcsi problem,
since the vectors are not always equal
(otherwise any "duel" would qualify).

@Darko: This seems to be a slightly economized
version with respect to the one in the Albrecht database.

@Seetharaman and Daniel: Indeed.
(= 6+5 )

Since the Ahues one is far superior, just added
to answer the question (yes, 3 motivations work).
(Read Only)pid=16058
(12) Posted by Hauke Reddmann [Friday, Oct 13, 2017 16:05]

Heres one for 1b2a by Klemanic: http://www.yacpdb.org/#244143

I tried my best to make it four RR oppositions (I had to slap
a sucking solution on it in return), but the matrix is fighting back.
Can you do it better?

(= 8+10 )

1.Rb4/c4/e4/f4? Rb3/c3/e3/f3! (1.Qa6!)
(Read Only)pid=16106
(13) Posted by seetharaman kalyan [Friday, Oct 13, 2017 21:01]

If you forgo the flight giving key and have a key like 1.Kb6 threat 2.Qc7 you get an almost dual free version.
(Read Only)pid=16109
(14) Posted by Jacques Rotenberg [Friday, Oct 20, 2017 00:40]

With only 3 tries but with black and white correction :

Colin Sydenham
Diagrammes 1980
(= 8+5 )

1.Rg8? [2.B×e7‡]
but 1…Re8!

1.Rg5!? [2.B×e7‡]
but 1…Re5!

1.Rg4!? [2.B×e7‡]
but 1…R×e4!

1.R×g3! [2.B×e7‡]
1…R~ 2.R(×)e6‡
1…Re8 2.Bg7‡
1…Re5!? 2.f×e5‡
1…R×e4!? 2.Sc×e4‡
(Read Only)pid=16116

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MatPlus.Net Forum Twomovers Pas de deux