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1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 b6 · ECO D00
Blackmar-Diemer Gambit Accepted: Ritter Defense is a chess opening that arises after 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 b6. It is classified D00 in the ECO system, and the position after these moves has white to move.
This line is a variation within the Blackmar-Diemer Gambit Accepted family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 b6.