[Retros] rights & ocassions / not answering Andrew anymore

[Guus Rol]

Hi Olli,

Yes, you got the idea! I am not sure about the precise position and timing
but basically DR cooks it if you aim for the position after Bf8.

These are the 2 endemic dangers when composing repetition draws:

1. Premature repetitions preceding the desired draw
2. Dead reckoning
DR can usually be detected by looking at the move folowing the diagram. If
it is an "only move" there is a definite risk of DR. Premature repetition
can generally be found by looking at the move preceding the diagram. If
that move is the same in all occurences of the diagram, we have a "premrep".

Note: I knew this before I published the problem and discussed it with
Peter vd Heuvel. He thought very few retro-solvers were aware of DR at the
time and considered the issue "ignorable". I could have added "-DR" to the
diagram otherwise to indicate that DR should not apply. I also avoided
discussing DR in relation to the "repetitions and castlings" but it is
clear there are strange interactions with it as well. DR may be looked at
as another "admin rule" with all consequences for that group. I am not sure
how Andrew looks at "DR by unavoidable repetition". May be interesting to
get his view.

Well done and best wishes, Guus Rol.
On Mon, May 26, 2014 at 9:09 PM, Olli Heimo <olli.heimo at luukku.com> wrote:

> Was dead reckoning not a draw in 2003? After 18. - Bf8 we can play 19.Na3
> Bd7 20.Nb1 Bc8 repeating the position for secomd time. After 32.Rg8+ we are
> in diagram position. I think that it is draw by dead reckoning. Olli.
>
> Nicolas Dupont kirjoitti 26.05.2014 kello 21:29:
>  > > And then there is the little bug nobody noticed and which I trust
> > > somebody will find out about some day.
> >
> > The fact that the repetition sequence is not "computer unique"? Indeed
> > the switchback 22...Bh6-g5 26...Bg5-Bh6 can be replaced by a
> > switchback from Ra8, but in this case black is loosing its castling
> > right, so the position is not repeated...
> >
> > >> > > (13+13) C+
> > >> > > Die Stellung ist Remis. BP in 41,5
> > >> > > 1. h4 g5 2. hxg5 d5 3. Th6 d4 4. Tg6 Lh6 5. Tg7 d3 6. g6 dxc2 7.
> d4
> > >> > > Dd5 8. Lg5 Dxg2 9. Kd2 Dd5 10. e4 Dxa2 11. Df3 De6 12. d5 Sf6 13.
> > >> > > dxe6 Sd5 14. Df6 Sc6 15. f3 Sd8 16. Lb5+ c6 17. Se2 Tg8 18. Txg8+
> > >> > > Lf8 19. Df4 Sf6 20. Th8 Sg8 21. Lf6 Lh6 22. Lg7 Lg5 23. Lf8 Sf6
> 24.
> > >> > > Tg8 Sd7 25. Lg7+ Sf8 26. Lf6 Lh6 27. Tg7 Sd7 28. Lg5 Sb6 29. Df6
> Sd5
> > >> > >  30. Tg8+ Lf8 31. Df4 Sf6 32. Th8 Sg8 33. Lf6 Lh6 34. Lg7 Lg5 35.
> > >> > > Lf8  Sf6 36. Tg8 Sd7 37. Lg7+ Sf8 38. Lf6 Lh6 39. Tg7 Sd7 40. Lg5
> > >> > > Sb6 41.  Df6 Sd5 42. Tg8+ remis
> >
> >
> >
> > _______________________________________________
> > Retros mailing list
> > Retros at janko.at
> > http://www.pairlist.net/mailman/listinfo/retros
>
> _______________________________________________
> Retros mailing list
> Retros at janko.at
> http://www.pairlist.net/mailman/listinfo/retros
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://one.pairlist.net/pipermail/retros/attachments/20140527/bca233c3/attachment-0001.html>