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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 04:18 PM UTC in reply to H. G. Muller from Sun Oct 22 11:52 AM:

I was editing this move (mvDvmpafcaKvmpafcabW) into the listing for yesterday's piece, and had a thought about it: where a (in bracket notation) becomes "all directions but back the way you came from," perhaps aa could be "all directions including back the way you came from." That could turn the original mvD[cvD-maK][cvD-mbW] to mvD[cvD-maaK].