Single Comment

(I)  Switching sides is not entirely unused.  For example, fourteen years ago  to the day mathematician Neto has two back-to-back suggestions under More Mutators section: 

•Optional-Side(N) : After the Nth turn, the 2nd player can choose to switch sides rather than respond.

•Switch(N) : At each set of N turns, players switch sides.

The year 2000 article 'Mutators' was groundbreaking as much for that term itself: http://www.chessvariants.org/newideas.dir/mutators.html.  Other cases of switching sides in fully-defined CVs are less extreme, more often many pieces changing sides at once, not the whole team.  It is convenient  Neto puts the two above up as alternative Mutators widely applicable. That is because many (hundreds) other candidate conditions are surely possible to trigger the right to switch sides than this SSCC chooses to invoke, namely defined Chain around two or more empty squares.  The surrounded two+ adjacent-spaces criterion is not necessarily more compelling than some others. Each different signal to allow optional Switch, with or without Chain, would constitute separate CV.  Which among several alternatives -- to be listed in follow-up comment (one example: three same-side pieces in a line) --
would be more aesthetic or present better heuristic?

Now the chain of minimum 6 of SSCC may seem rather cumbersome, yet may be acceptable since the Switch should not be too easy to achieve.