1. fianchetto - Noun
2. fianchetto - Verb
fianchetto (plural fianchetti)
(chess) The development of a bishop by moving it one square to a long diagonal; specifically, a set of opening moves where a bishop is developed to the second rank of the adjacent knight file.
fianchetto (third-person singular simple present fianchettos or fianchettoes, present participle fianchettoing, simple past and past participle fianchettoed)
(chess) To play a fianchetto.