George Duke wrote on Wed, Feb 26, 2014 01:05 PM EST:
Here is subvariant of SSCC, retaining uncurtailed switching option, but altering Pawns to Berolina, and adding Camel and Zebra, http://www.chessvariants.org/piececlopedia.dir/zebra.html.
(1) Allow unlimited continuous switching by the one side on move subject to Chain present, as originally defined in Azlan Iqbal's SSCC.
(2) Use two innovations from the fide-founding 1920s: (a) Capablanca 8x10 or 10x10 board (http://www.chessvariants.org/large.dir/capablanca.html); (b) Ten Berolinas, the other orthodox pawn as replacement.
Berolina has two forward non-capturing one-steps possible, http://www.chessvariants.org/piececlopedia.dir/berolina.html, which would further facilitate Chain (re-)formation.
(3) Add one Camel, of 700-year-old http://www.chessvariants.org/piececlopedia.dir/camel.html, and one 19th-century Zebra per side, likewise to enable versatile reach towards chain-making squares between, as oblique, those of regular Q-R-B-N.
(4) So the starting array becomes bbbbbbbbbb and RNB(Camel)QK(Zebra)BNR, giving additional ballast to Chain formation on Capa's grand ten-deep.