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

[Nicolas Dupont]

Dear Andrew,

> Please share a comprehensive specification for your language.

When a piece A is performing a theme X and then a theme Y, the  
specific notation (established in the future proof game setting - I  
don't know if there is a general agreement) is (Y&X)(A) and not  
(X&Y)(A).

Of course it can be generalized for successive themes X, Y and Z  
performed by A, with notation (Z&Y&X)(A).

Best,

Nicolas.