George Duke wrote on Thu, Feb 6, 2014 08:54 PM UTC:Good ★★★★
In half-century old Rotation Chess, players switch sides every 10 moves, and in 17-year-old SchizoChess, http://www.chessvariants.org/boardrules.dir/schizo.html, the board halves right and left interchange every five moves. For mind-bending, just every five moves do both: swap sides and halves, combining two natural Mutators. All other rules the same on 8x8.