Chess 960 uses, well, 960 and this seems to solve completely the problem. The issue is that some of those positions can be quite messy, specially if you want to play some variant like crazyhouse 960.
Instead, I have played a few games (both chess and ZH) with this method: the same rules as 960 , but the king and queen are kept on their original squares. This allow only 32 positions, but these look way more "natural" (specially for castling). A few times I have played using starting positions with rotational symmetry, too, as in shogi, making them 64.
Would those 32 (or 64) positions be enough to nullify opening prep, for strong players?
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