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H. G. Muller wrote on Mon, Jan 2, 2023 09:49 PM UTC in reply to Daniel Zacharias from 09:34 PM:

It is a consequence of the Betza parser not printing any error messages. In [W?fB] the f and B are conflicting input: f says you should keep moving in the same direction as the W step, while B says you must move diagonally. So it is an invalid specification, with undefined result.

What happens in practice is that the [...] notation is implemented by a pre-processing step that replaces it with the original XBetza notation using the a modifier. It thus uses the first step as the atom, tests whether a range-toggle is required for deciding it should be prefixed with a or ya, and takes the modifiers on the second leg. So [W-fB] becomes yafW, which is what [W-fR] would become too. The B or R are simply ignored (apart from detecting that they are sliding moves, so that the y will be prefixed). The preprocessor is not smart enough to understand directionality of the second-leg atom, nor that non-matching directionality would require addition or removal of an s to get the correct bend. It treats all second-leg atoms like they are K or Q, and you have to supply the s yourself.

Perhaps this can be improved one day.


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