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1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 b5 5.Bg5 exd5 6.cxd5 h6 · ECO E10
Blumenfeld Countergambit: Spielmann Variation is a chess opening that arises after 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 b5 5.Bg5 exd5 6.cxd5 h6. It is classified E10 in the ECO system, and the position after these moves has white 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 exd5 6.cxd5 h6.