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Betza notation (extended). The powerful XBetza extension to Betza's funny notation.[All Comments] [Add Comment or Rating]
Bob Greenwade wrote on Tue, Nov 21, 2023 05:51 PM UTC in reply to H. G. Muller from 04:44 PM:

Why use aa when you could use ab? In Betza notation directional modifiers indicating direction sets with an empty intersection means one or the other, and a and b do not have moves in common.

D'oh! I didn't think of that. ab it is.

Edit: That doesn't quite work as advertised on the ID, actually.