[Retros] 50 moves rule

[CAILLAUDM at aol.com]

Hello,
 
Explanation is sketched in an article by Nikita Plaksin in problem 188-193  
(1979), and certainly can be found in other places.
 
(Approximative (I was not there!) historical background, not in the article  :
60 years ago, there was no "world organization" for composers;
the structures we know today were initiated under the impulse of the great  
yugoslav composer Nenad Petrovic; he was the man who made the first FIDE  
Albums and ran the magazine "problem" that later became "organe officiel de  la 
C.P.C.E. de F.I.D.E."; he organized the first international meeting of  
problemists in Piran (now in Croatia) in 1958;
a commission elaborated there a Codex for composition; and since on  this 
historical occasion composers world emancipated from players  world, some 
differences can be found on some points between Codex for  composers and Codex for 
players...).
 
In his article "50x50" which consists in 50 originals retros (!!!)  featuring 
50 moves rule, Nikita Plaksin makes the distinction between "Codex  FIDE" and 
"Codex Piran". From what I understand from russian, the main  distinction is 
castling that plays the same role than capture or pawn move in  "Piran" but 
not in "FIDE".
In his article, NP counts 11 problems correct under "Codex FIDE" only  
(otherwise the problem would be cooked by an early retraction of castling), 6  
problems correct under "Codex Piran" only (the critical move is castling)  and 33 
problems correct under both Codexes.
 
But...the commission(s) works every year and there are some evolutions in  
the Codex(es).
If we refer to the book by Wolfgang Dittmann ("Der Blick zurück"),  published 
this year and now the up-to-date reference for retros, the updated  rules for 
composition are now to be found in "Codex Pula" (1997) (see  p.73-74).

>From what I understand from german, there seems to be no more mention of  the 

"Piran" castling, but there is still an important distinction between the  
"Codex Pula" and the FIDE rules "for players", interesting to know. It concerns  
both the 50 moves rule and the three-times repetition of a position.
In the "Laws of Chess" the draw occurs "upon a correct claim by the player  
having the move".
In "Codex Pula", the draw occurs automatically after completion of the  
theoretically drawing move.
 
There may be some difference in results (maybe not ?!...always my german) :  
I see no specific mention of the case where the 100th "no pawn, no capture"  
single move is a mate.
So in the Thema Danicum problem by Tom with black to play :
black is mating under "Codex FIDE"
the position is automatically drawn before black can capture wK under  "Codex 
Pula" (??!).
 
And this other position by Tom (1st Prize Rex Multiplex 1983  Draw)  :
n4K2/b1pprppp/1p2p3/2p5/N1P3P1/BkP1P3/1P2PPP1/3N1BR1
would be illegal under "Codex Pula" but legal under "Codex FIDE" (players  
simply "forgot" to claim the draw!).
 
Best,
 Michel
 
 
 
Dans un e-mail daté du 24/12/2006 08:45:16 Europe de l'Ouest,  
afretro at yandex.ru a écrit :

Hello to  all,
Some 30 years ago Nikita Plaksin published in Shakhmaty v SSSR a small  
article in which he wrote that, according to the (then) recently adopted new  
version of 50-moves remis rule, castling was proclaimed to play the same part  as 
pawn move or capture. For decades I was convinced that this was indeed so;  
moreover, FIDE Album 1992-1994 contains problem H19 from S. and Y. Volobuyev  
(not Volibiev, as in the Album) which is based on the above-mentioned  
interpretation of the 50-moves rule. Then I discovered that this  interpretation is not 
present in any legal documents. Makes one wonder where  that rumor originated 
from.
Merry Christmas to everyone who celebrates it,  and a happy New Year to every 
member of the Retro  Corner!
Yours,
Andrey




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