to puzzle, perplex, baffle, bewilder (somebody); to afflict by being complicated, contradictory, or otherwise difficult to understand
To mix up, muddle up (one thing with another); to mistake (one thing for another).
To mix thoroughly; to confound; to disorder.
To be confused.
To find or learn something for the first time.
To create by moving a piece out of another piece's line of attack.
To question (a person) as part of discovery in a lawsuit.