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MatPlus.Net  Forum General Is "square vacancy" a theme? |
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| | | (1) Posted by Oliver Petrov [Tuesday, Sep 28, 2010 13:56]; edited by Oliver Petrov [10-09-28] | Is "square vacancy" a theme?
If not, what is it? :-)
I did read a book which clasiffies it as a theme, but it is not given as such in many places on the Internet.
In the book, which is in Bulgarian, it is formulated as "freeing sacrifice" (isn't it actually "annihilation"?)
| | | (2) Posted by seetharaman kalyan [Tuesday, Sep 28, 2010 14:29] |
As a beginner, you may like the following website of the english magazine 'The Problemist'. It has a number of good examples with detailed explanations.
http://www.theproblemist.org/
| | | (3) Posted by Oliver Petrov [Tuesday, Sep 28, 2010 14:31] |
Thank you! I am going to read and in 1 month I will be back.
| | | (4) Posted by Hauke Reddmann [Tuesday, Sep 28, 2010 18:24] |
- It's a theme, of course. Rather simple, but so what.
- It's a building block of more complicated themes, like Umnov.
- And surely the record is listed in the Morse task book :-)
- "Theme" is just a pigeonhole. It counts what you make of it!
Hauke
| | | (5) Posted by Marjan Kovačević [Wednesday, Sep 29, 2010 00:49] |
This seems to be a problem with translation:
Oliver wrote ..."freeing sacrifice" (isn't it actually "annihilation"?)...
It sounds to me as the Räumungsopfer theme, a well known by this German name and largely popularized through the WCCT competition.
Oliver, you can find an article by Yury Gordian, in Mat Plus Review 8, Winter 2008, dedicated to the theme.
| | | (6) Posted by Oliver Petrov [Thursday, Sep 30, 2010 16:55]; edited by Oliver Petrov [10-09-30] |
Chessville gives it as "square-vacating sacrifice"
| | | (7) Posted by Frank Richter [Friday, Oct 1, 2010 07:23] |
It is always funny to see, how such a quite "cumbersome" language like German is able to create precise and short terms for difficult circumstances (like a Räumungsopfer or a Kraftopfer). What would be Zugzwang or Zeitnot in English, for ex.?
| | | (8) Posted by Hauke Reddmann [Friday, Oct 1, 2010 11:26] |
Schweinhund! :-) The latter is simply "time trouble", an exact translation.
You can hardly say "move forcing" or any other construction, though,
because (not mentioning the war or the ugly construction) it would
get confused with "forced move". (Whereas no German has any trouble
to tell a Zwangszug from Zugzwang, since in German the word order matters.)
Hauke
| | | (9) Posted by Steven Dowd [Saturday, Oct 2, 2010 07:14] |
Zugzwang= movebound
| | | (10) Posted by [Saturday, Oct 2, 2010 12:10]; edited by [10-10-02] |
Oliver Petrov asks:
>Is "square vacancy" a theme?
>
>If not, what is it? :-)
Depends on if you look at it analytically or not. Just as a morpheme is the smallest
part of a word that carries a meaning, square vacation is perhaps a similar
'smallest unit' in problem analysis -- and I call that 'effect', borrowing the term
from T. R. Dawson, who did a remarkable work in this area in his 'Systematic Terminology',
a series of articles published in the problem section of B.C.M. in 1947--1950.
Is such a 'smallest unit' enough to make up a theme or not? Is a single morpheme enough to
make up a word? Yes, but far from all. (Sorry about that :-)
It used to be. The Brede Theme is probably nothing but, but it is also a very old theme, and they tend
to be structurally simple.
Today, I'm not sure it is enough anymore.
T. R. Dawson describes the Brede Theme a 'NS-block', which I interpret as 'self-unblock'.
(This only describes the vacation ... the following occupation is not included, but assumed
to be obvious.) So here it's a theme on its own.
Nanning and Koldijk in Thema-Boek insists that Brede Theme is a square vacation involving a
white Q and a white S -- in this case, the square vacation is not the whole theme, but
only a part, to which has been added restrictions on the pieces involved.
Judge for yourself:
J. Brede
 (= 7+8 )
#2
Almanack, 1844
(Added: Dawson notes that this is not pure square vacation, as the queen is needed for a secondary purpose.
But Brede is unlikely to have been disturbed by that lack of purity.)
(Added more: ... and perhaps I misunderstood what term is actually questioned? Still ...)
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