3-4 point low approach knights move extension
Common continuations are
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The approach at is usually a show of strength either at the top side or the left side, and leaves Black with a open skirt. Black usually chooses to pincer at either a or b.
If the pincers are infeasible, defending the corner by and is common. However, the Black stones are inefficient.
If Black is able to foresee that would be a severe move, then might not be a suitable response to . In this case, Black may consider playing at a instead. See 3-4 point low approach two space extension for more information.