Baltic Defense

The Baltic Defense (also known as the Grau Defense, or the Sahovic Defense) is a chess opening characterized by the moves:
The Baltic is an unusual variation of the Queen's Gambit Declined (QGD). In most defenses to the QGD, Black has difficulties developing his . This opening takes a radical approach to the problem by bringing out the queen bishop immediately.
The Baltic has not found widespread acceptance among chess masters, but some world-class players have used it including grandmasters Paul Keres and Alexei Shirov.
The "ECO" code for the Baltic Defense is D06.
White responses.
White has several replies to this opening, including 3.Nf3, 3.cxd5, 3.Qb3, and 3.Nc3. Play might continue: