[Retros] HAP animal conventions

Bernd Gräfrath retromode at web.de
Mon Nov 26 09:57:47 EST 2007

Dear retro friends,

I agree with Alain and Mark that a convention is good if it leads to good problems.
Perhaps there could be different conventions if this is fruitful!? (Cf. the types "Calvet" and "Cheylan" in Anticirce Procas.)

Concerning the Valladao task: This is too easy if a convention is used that marks castling as "O". Alternatively, one could regard castling as a king moved, simply marked "H", and then the Valladao task is a challenge.

Best wishes,


> -----Ursprüngliche Nachricht-----

> Von: The Retrograde Analysis Mailing List <retros at janko.at>

> Gesendet: 26.11.07 13:55:56

> An: retro <retros at janko.at>

> Betreff: [Retros] HAP animal conventions


> Dear Retro Fans


> > So I think that Alain can present both of my problems at his website.


> I even added the 3rd! ;)


> > However, Mario points out that Alain's conventions (see his e-mail of 20 Nov.

> > 2007) are more specific than those mentioned by Peter, whom he quotes. I

> > think there are good reasons to accept the additonal codes of "HA" for

> > castling and "P=A" or "P=H" for promotions. The danger of cooks is more

> > easily avoided, and then we can be more strict about the uniqueness of the

> > solution (including the order of moves).

> > It is more controversial whether e.p.-captures should be marked differently

> > from the normal PxP, namely by P%P. And I am not sure whether Alain is in

> > favour of the code "P=?", in addition to "P=A" and "P=H".


> This are not really my conventions. I feel that if someone has a word

> on it, it would be Mark Tilford. But the problems are quite pleasant

> with the given conventions.


> As for P=?, i intended P=H, P=A only. This gives a lot of information,

> but it's in the spirit of the theme (always telling the types involved).


> Changing castling to O is just for typographical reasons.

> Any suggestions are welcome. Maybe you prefer the old HA notation?

> Also the name. I used HAP instead of Animal Chess... I'm not on

> firm grounds on those (not so important) decisions.


> Oh, and now for the Valadeo Monteiro theme...


> Best regards, Alain



> Alain Brobecker (abrobecker at yahoo.com) |_ _ _ |_

> http://abrobecker.free.fr/ |_)(_|(_|| ) of Arm's Tech



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