[Retros] rights & ocassions / not answering Andrew anymore

[per olin]

Dear all,

The discussion here has centered around situations, where the subsequent play makes only one start of a game possible from many possibilities. The problem from 2003 is probably not of this type.   The move sequence up to 18.Txg8+ is unique (C+ Euclide);   the repetition moves are separate from this.  I recall some time ago testing the repetition phase with Popeye a=>b.  I am not sure did I get the whole sequence tested, could be that I stopped after having only the major part tested.  Perhaps somebody with better computer abilities or the author can verify the uniqueness of the repetitions.

Best wishes

Per





Nicolas Dupont kirjoitti 24.05.2014 kello 00:49:
> Dear all,
> 
> > P1011937,
> > Guus Rol
> > R222 Probleemblad 12/2003
> >
> > (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
> 
> If I understand, the stipulation means that there are plenty of  
> solutions (for example moves by the wQ are not uniquely determined),  
> but only one where the diagram position already occured 2 times during  
> the solution.
> 
> It seems curious that PDB asserts it is computer tested with Natch,  
> although shorter games with same stipulation are not (e.g. P1003993 in  
> 11.5). Is it a mistake or is there really a way to check such  
> problems? Looking at hand each solution to detect the only one  
> satisfying the hypothesis?
> 
> Best,
> 
> Nicolas.
> 
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