 Other possible moves are 5.Qb3, 5.g3 and 5.cxd5, the last of which, after 5...exd5, leads to a line of the QGD Exchange Variation where White's early Nf3 enables Black's queen bishop to freely develop, which should give equality ("ECO" codes D43 and D45).It is worth noting that 5.Bf4 is considered somewhat inaccurate, as 5...dxc4 is favorable for black.For the Semi-Slav the "Encyclopaedia of Chess Openings" designates codes D43 through D49.