960^2 × 16 = 14,745,600
Chess18^2 × 16 = 5,184
Chess36^2 × 16 = 20,736
I think I know Chess18 that's where the king and rooks stay in their original squares and then shuffles the Q Bs Ns and gives you 18 different starting positions. The K Rs placement make it easier to castle in OTB Chess18 games. Chess18 is manageable and can be studied individually for their openings. A lot better than playing Chess repeatedly from just 1 starting position.
What I don't know is Chess36?
960^2 × 16 = 14,745,600
Chess18^2 × 16 = 5,184
Chess36^2 × 16 = 20,736