Howard Staunton,
The blue book of chess
“ Concerning the Bishop.—When the game is opened by each party with King's Pawn to King's 4th square, the King's Bishop is somewhat superior to the Queen's, because it can be sooner brought into play, and may be made to bear immediately on the King's weak point, his Bishop's Pawn. It is desirable therefore generally to exchange your Queen's Bishop or Queen's Knight for the adversary's King's Bishop. The King's Bishop should rarely or never be played to the Queen's 3d square before the Queen's Pawn is moved. ”
