Is there some mistake here?

Hi @avif, Lines 32 to 35 tell us that "...superior chess players have exceptional memory for configurations of chess pieces, but only if those configurations are typical of chess games." The word "configurations" here means arrangements of chess pieces on the board i.e. not sequences of moves, just various placements for the pieces. While we could likely assume that superior chess players do not have exceptional memory for sequences of moves that are typical of games other than chess, there is nothing in the passage to support this claim. Hope this helps! Please let us know if you have any further questions.

Thanks