Related Openings
QGD - Orthodox defense, Classical, 13.d1c2 (Vidmar)	d4, d5, c4, e6, Nc3, Nf6, Bg5, Be7, e3, O-O, Nf3, Nbd7, Rc1, c6, Bd3, dxc4, Bxc4, Nd5, Bxe7, Qxe7, O-O, Nxc3, Rxc3, e5, Qc2
QGD - Orthodox defense, Classical, 13.d1b1 (Maroczy)	d4, d5, c4, e6, Nc3, Nf6, Bg5, Be7, e3, O-O, Nf3, Nbd7, Rc1, c6, Bd3, dxc4, Bxc4, Nd5, Bxe7, Qxe7, O-O, Nxc3, Rxc3, e5, Qb1