Haven't done this in a while

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Kingfisher

Just to illustrate a common mistake in QGA:

sstteevveenn

I think 4.a4 is the refutation of 3...b5

shuttlechess92

what was that?  maybe black was rushed or something, looks more to be carelessness than anything.

Kingfisher

Black was reckless, but 4... c6 I have seen often. It is a frequent mistake.