I'd elaborate on the source, but I can't read Chinese.
Comment if there's more to say.
And please tell me why you deactivate this problem again, if you do.
(;AW[eq]AB[cp]AB[pq]AB[mp]AW[rq]AW[qo]AW[pn]AB[pl]LB[iq:A]LB[jq:B]C[A or B?]AP[goproblems]
(;B[iq]C[Yup. You can afford to be more agressive here. This pressures white's stone much better than B.RIGHT])
(;B[jq];W[hq]C[Too passive. White has plenty of room to make himself comfortable.]))