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1.Nf3 d5 2.g3: Qb3, and the recapture on d5
1.Nf3 d5 2.g3 Nf6: 84 games, 35%, your most frequent losing position. White castles, plays c4 late, and aims at b7.
Reminder: which square does your bishop leave undefended when it leaves c8?