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| (1) Posted by Eugene Rosner [Thursday, Sep 22, 2016 19:00] |
change of function
Hi All-
is there a concise definition of this chess problem term?
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| (2) Posted by Wilfried Neef [Sunday, Sep 25, 2016 10:43] |
from FA 2007-9, p.598: in two variations or phases, two units exchange the roles they play for the attainment of the aim
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| (3) Posted by Nikola Predrag [Sunday, Sep 25, 2016 13:11]; edited by Nikola Predrag [16-09-25] |
This is OBVIOUSLY a definition of the EXCHANGE of functions.
FA terminology has deprived the word "change" of its meaning.
Which term could be used when one piece changes its function throughout the author's solution?
As an extreme example, there's the first problem on the page:
http://www.jurajlorinc.com/chess/xbartolo.htm
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| (4) Posted by Andrew Buchanan [Sunday, Sep 25, 2016 13:45] |
In PDB, this concept is termed "Funktionswechsel: Zwei (oder mehrere) Figuren tauschen in verschiedenen Phasen ihre Aufgaben." There is no English or French translation currently. Perhaps "Role Exchange" and "Échange de Rôles" would serve?
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| (5) Posted by seetharaman kalyan [Sunday, Sep 25, 2016 20:27]; edited by seetharaman kalyan [16-09-26] |
How about "Change-of-function" (single word!)? :)
___ (Added later). Sorry this was just for fun. As Nikola and Georgy point out, exchange of function is what is significant.
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| (6) Posted by Nikola Predrag [Sunday, Sep 25, 2016 20:56] |
The point is that 'change' and 'exchange' do not have the same meaning. The apparent disrespect of the words and meanings is not only irritating and insulting, but it leads to misunderstanding of the whole concepts.
But who cares about it!?
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| (7) Posted by Eugene Rosner [Sunday, Sep 25, 2016 21:38] |
I do! I'd like a definition of the former, if it exists!
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| (8) Posted by Andrew Buchanan [Sunday, Sep 25, 2016 22:10] |
I have made changes to the PDB keyword here, e.g. "Exchange of Roles".
PDB is great, but declared enthusiasts for terminological accuracy are needed to fill the many gaps in the keyword set. I am sure Gerd Wilts would be over the moon to have more volunteers.
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| (9) Posted by Georgy Evseev [Monday, Sep 26, 2016 13:10] |
As far as I can tell, there is no such thing as "change of funtion". This is too general a term.
There is:
1. Exchange of functions of pieces. See post 2.
2. Change of function of move (mainly twomovers). There are three main functions of white move (key/try, threat, mate) and two main functions of black move (defence, refutation). The same move has one of these functions in one phase and another one in other phase. The term is mainly used when there is no obvious pattern in change.
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| (10) Posted by Rauf Aliovsadzade [Monday, Sep 26, 2016 18:34] |
Григорий!
Возможно,Ю.Рознер имел в виду перемену защитных мотивов ,просто он обобщённо поставил вопрос.
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| (11) Posted by Rauf Aliovsadzade [Monday, Sep 26, 2016 18:37] |
Eugene,
You might have meant defensive motifs,mightn't you?
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| (12) Posted by Eugene Rosner [Wednesday, Sep 28, 2016 04:15] |
no. but I think George is closest with his 2nd point.
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| (13) Posted by Rajendiran Raju [Wednesday, Sep 28, 2016 08:17] |
following two twin helpmates , we call it as "Change of function" --- ?!
1) Jointly Composed By
Aliyev (Azerbaijan) and
N.Parkhomenko (Ukraine)
Problem No : 4602
The Ural's Problemist 48
 (= 3+5 )
H#2 EACH 2 SOLUTIONS
a) Diagram
B) BPa5 ---> h7
a) Double Sacrifices by Double Black Pieces -- !!
b) Single Sacrifice by Single Black Piece -- and Piquant two Unpining too -- !!
chameleon echo mates in different corners of the board.
2) Composed By
IM Valery KOPYL (UKRAINE)
PROBLEM nO : 1386
COMMENDATION
PAT A MAT 2009
 (= 2+9 )
H#2 EACH 1 SOLUTION
a) Diagram
b) BPf5 ---> g6
Nice Unpin combined with interference and
Delighting Delayed Umnov with model mate.
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| (14) Posted by Rauf Aliovsadzade [Wednesday, Sep 28, 2016 15:41] |
Eugene,
What George pointed out is Urania.
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| (15) Posted by Eugene Rosner [Wednesday, Sep 28, 2016 19:38] |
only when 1 particular move is all 3.
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| (16) Posted by seetharaman kalyan [Thursday, Sep 29, 2016 07:49] |
Raju... Can you please point out which pieces exchange functions (not change function) in Kopyl's example.
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| (17) Posted by Rajendiran Raju [Thursday, Sep 29, 2016 09:58]; edited by Rajendiran Raju [16-09-29] |
Dear Raman Sir---
In 1st one BPa5 moved to h7 then function changed.
In 2nd Kopyl's Black pawn and Black Knight both the pieces exchanged its functions .
above is mine understanding.
Thanks for your reply and igniting me.
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| (18) Posted by Rauf Aliovsadzade [Friday, Sep 30, 2016 23:29] |
Sure!
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