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The Exchange Slav: …Qb6 doesn't work everywhere
In the exchange lines, your score drops: after 1.d4 Nf6 2.c4 c6 3.Nf3 d5 4.cxd5 cxd5, 58 games, 34%. And against 3.Nc3 Nf6 4.e3 Bf5 5.cxd5, 25 games, 32%. Here, the reflex answer to Qb3 loses a pawn.
Recap: against 6.g3 e6 7.Bg2 Nd7 8.O-O, which move?