[Retros] Call for original problems for the french retro solving competition

[Nicolas Dupont]

> *Roberto Osorio*
> 1n4k1/1pp3np/6b1/3p1p1p/1Pq5/2P5/P1P1P1PP/RNBQKBNR
> PG in 14.5 moves     (15+11)     C+
>
>  1. Pf2-f4   Cg8-f6     2. Pf4-f5   Cf6-h5     3. Pf5-f6   Pd7-d5
>  4. Pf6xe7   Fc8-f5     5. Pe7xf8=F Ff5-g6     6. Ff8-c5   Dd8-h4
>  7.* Fc5-f2*   Dh4-c4     8. Ff2xa7   0-0        9. Fa7-c5   Ta8-a3
> 10. *Fc5xf8*   Ta3-c3    11. Pd2xc3   Pf7-f5    12. Fc1-h6   Pg7xh6
> 13. Ff8-a3   Ch5-g7    14. Pb2-b4   Ph6-h5    15. *Fa3-c1*
>
> *Author:* one man touch on the three home-related squares, the originating
> Pawn one (f2, Pawn circuit),
> the bishop promotion one (f8, Donati) and the original bishop (c1,
> Pronkin), (PC & DO & PR)(B).

Please remember that the correct notation is (PR & DO & PC)(B). Indeed  
the first performed theme should appear at the very right of the  
notation, and so on (as for composing functions in math).