A drawer for openings I play badly. Writing the idea down helps more than memorising another twelve moves.
2.Bf4e3 shuts it in. Everything else
is setup, and the setup is the same against almost anything — which is
the appeal and also the trap: it invites playing on autopilot until a
pawn break arrives that the setup has no answer to.f5 before the chain
closes. My mistake is chasing it with h4-h5 and calling
the resulting hole a plan.