I'd elaborate on the source, but I can't read Chinese.
Why is this problem being deactivated?
(;AB[qp]AB[dp]AW[lq]AW[iq]LB[fq:B]LB[oq:A]C[A or B?FORCE]AP[goproblems]
(;B[cl];W[ql]C[this is just to get the right board view])
(;B[oq]C[Yup! Enclosing a 3-4 point is more important. A 3-4 enclosure is particularly important early game because it secures the corner well; it takes two moves to completely secure the corner at a 4-4 point.RIGHT])
(;B[fq];W[oq]C[White took the more important point :(]))