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1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 b5 5.Bg5 · ECO E10
Blumenfeld Countergambit: Duz-Khotimirsky Variation is a chess opening that arises after 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 b5 5.Bg5. It is classified E10 in the ECO system, and the position after these moves has black to move.
This line is a variation within the Blumenfeld Countergambit family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 b5 5.Bg5.
Each of these is a named opening reached by playing on from 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 b5 5.Bg5. Open any of them to load the position on the board.