1 general:: Just and honest, as in He won the race fair and square. This redundant expression? fair and square mean essentially the same thing? probably owes its long life to its rhyme. [Early 1600s]
American Heritage Idioms
2 general:: Phrase(s): fair and square completely fair(ly); justly; within the rules. • She won the game fair and square. • The division of the money should be fair and square.
McGrawhill's American Idioms And Phrasal Verbs