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2…Bf5: castle before the queen
1.d4 d5 2.Bf4 Bf5: 25 games. After 3.c4 e6 4.Nc3 Nf6 5.e3, the position came up 16 times, for 34%: the most frequent losing position in the family.
Recap: Qb3, …Bb4, your king on e1. Which move still held?