A white play at is a constant nuisance in variations where black plays elsewhere--so black protects at immediately. After this, black has no problem defending against white attacks at, for example, a or b.
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is a constant nuisance in variations where black plays ![[Diagram]](diagrams/12/d74ab022ba6ce1451f276308e3cad10f.png)
![[Diagram]](diagrams/52/7a31dd5ff00247e2a279eb00021b5b8f.png)