I'd elaborate on the source more, but I can't read Chinese.
Also, I'm not dead sure I understand this answer, so comment if there's more to say.
(;AW[op]AW[pq]AW[qp]AW[qo]AB[po]AB[pn]AB[qn]AB[kq]AW[fp]AW[fq]AW[eq]AW[dq]AW[cp]AW[co]AB[do]AB[ep]AB[dn]AB[cn]C[A or B?]LB[hq:A]LB[nq:B]AP[goproblems]
(;B[sl]C[If you guessed this, you deserve to get it right.RIGHT])
(;B[nq]C[White is weaker on this side.RIGHT])
(;B[hq];W[mq]C[White is comfortable on both sides, and black is not.]))