[Retros] How many times could a Diagram be repeated during aproofgame?

[Rol, Guus]

Olli,

Roberto indicated in an earlier response that he operates in the context
of the retro-conventions in de Codex. The automatic draw indicated in
article 18 takes place after the actual 3rd repetition has been
completed. As an example, Proca problems may start from a drawn end
state.

Now there is a question mark hanging over the validity of certain
versions of the Codex. My current understanding is that article 18 was
added in 1991 in Rotterdam. I am uncertain whether or not this
Codex-version was officially ratified - and if not, what that means.
Could it mean that we now have a conventional deviation from the
convention?

Anyway, (as noted by Alexander George) without an automatic draw rule a
position may be repeated indefinitely since claims are not mandatory.

Guus Rol.



> -----Oorspronkelijk bericht-----

> Van: retros-bounces at janko.at [mailto:retros-bounces at janko.at] 

> Namens Olli Heimo

> Verzonden: dinsdag 5 juni 2007 10:20

> Aan: The Retrograde Analysis Mailing List

> Onderwerp: Re: [Retros] How many times could a Diagram be 

> repeated during aproofgame?

> 

> 

> Rol, Guus kirjoitti 04.06.2007 kello 19:38:

> 

> > (d) the drawn position can still be part of the proof game

> 

> I think that it can't. The third repetition of the position 

> is a virtual position, which occurs on the protocol. Assuming 

> that White's last move was 45.Bf4 repeating the position for 

> third time it is illegal. He should write that move on the 

> protocol and claim for draw, but not make the move on the 

> board. My calcu- lations end to 42.5 moves. It is at least 

> fourth different answer. Someone could show the actual moves 

> rather than trying to get the answer by addition and 

> multiplication. Olli. _______________________________________________

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