(;AW[dd]AW[gc]AW[cq]AW[co]AB[fp]AB[jq]AB[qd]AB[oc]AB[pp]AB[qp]AW[qn]AW[pj]C[FORCE]TR[dj]TR[cf]TR[qh]TR[on]AP[goproblems] (;B[qh]LB[qh:1]LB[qg:E]LB[ql:A]LB[on:C]LB[np:D]LB[dj:B]C[Black extends from his enclosure with 1, aiming to split White's stones with an invation at A (see problem # 20). If Black played 1 at B, White would play C-Black D-White E, establishing a strong position on the right.RIGHT]) (;B[on];W[pl];B[qg];W[qi];B[en];W[dm];B[fl];W[dj];B[nl];W[jl];B[jn]) (;B[cf];W[ch];B[ef];W[eh];B[bd];W[cc];B[bg];W[bh];B[gf];W[cl]) (;B[dj];W[on];B[np];W[qg]C[Not good for Black...]))