One of the earliest references to "irregular openings" in chess literature was made by William Lewis in his 1832 work "Second Series of Lessons on the Game of Chess". Lewis classified openings under the headings "King's Bishop's Game" (1.e4 e5 2.Bc4), "King's Knight's Game" (1.e4 e5 2.Nf3), "Queen's Bishop's Pawn Game" (1.e4 e5 2.c3), "King's Gambit" (1.e4 e5 2.f4), "Queen's Gambit" (1.d4 d5 2.c4) and "Irregular Openings" (all other openings). Lewis comments that the irregular openings are "seldom played, because they are generally dull and uninteresting". Among the openings he analyzes under this heading are the French Defence and English Opening (both now considered standard), Bird's Opening and a few 1.d4 d5 lines without the Queen's Gambit. Lewis assigns no names to these openings.