London System · Line 12 of 19
...Qb6: guard b2 with Qb3
vs 1...d5 2...Nf6 3...c5 5...Qb6
Black's queen often comes to b6 early, hitting b2 and adding a third attacker on d4. Meet it queen to queen: Qb3 guards b2 and offers a trade that would open the a-file for your rook.
As always.
Pawn to d4.
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