Doesn't that prove the opposite as the statement in the first paragraph if they were only as good as non-players? I assume there's a typo in there somewhere because I would expect the original thesis to be true. My gf would squarely beat me at chess960 just because she sees the relations between the pieces a million times faster. She can walk into a room and look at the board I've been 'rearranging' (playing on) for 45 minutes and still know what I should do faster than me