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H. G. Muller wrote on Thu, May 20, 2021 03:42 PM UTC:

Chiral move sets

A problem with the group repetition is that the left-right reversed path for an oblique atom is not always equivalent. E.g. with 'sharp' turns (bl or br) for a Knight the path e4-f6-g4 (br) is a D step, while e4-f6-d5 (bl) is an F step. This requires splitting of the oblique moves into two chiral sets. This can be done by using hl or hr as leading direction set.

It is a tossup, however, whether the l or r specified in this initial direction set conforms to the path that follows. We therefore define two new direction sets, hs and hq, which by themselves would mean 'all directions' and are thus pointless. But when a repeated group contain z and/or q follows, the meaning of the latter will be determined as if the hs had mentioned the l and r that would be in the hl or hr set to which the initial step belongs, while the hq would count as the opposit direction.


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