[Retros] rights & ocassions / not answering Andrew anymore

[Nicolas Dupont]

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.