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For anyone who might find the approach helpful, a very rough try at a
'faceted definition' of a movement rule for 'an Extended Relay Chess
Family' might look something like this. Pick one from each bracketed
category to get a CV (design new options that fit the structure; design a
new structure ...).


'Chessmen have intrinsic movement patterns: [intrinsic movement rules].
The movement powers of [affected group] are temporarily modified by the
intrinsic movement patterns of other chessmen. Chessmen affected by this
rule temporarily gain the unshared intrinsic movements of [gain source]
when [gain condition]; they temporarily lose the intrinsic movement
patterns shared with [loss source] when [loss condition].'


Some sample category options:

[intrinsic movement rules]   
  these patterns are the same as in standard chess, ...
[affected group]
  RNBQ, ... 
[gain source]
  friendly affected class units, 
  hostile affected class units, 
  any affected class units, ...
[gain condition]
  intrinsically observed by the source,  
  intrinsically observing the source,
  on a space adjacent to the source, ...
[loss source] 
  friendly affected class units, 
  hostile affected class units, 
  any affected class units, ...
[loss condition]
  intrinsically observed by the source, 
  intrinsically observing the source,
  on a space adjacent to the source, ...