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Danish Gambit Declined: Sörensen Defense is a chess opening that arises after 1.e4 e5 2.d4 exd4 3.c3 d5. It is classified C21 in the ECO system, and the position after these moves has white to move.
This line is a variation within the Danish Gambit Declined family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.e4 e5 2.d4 exd4 3.c3 d5.