(;GM[1] FF[4] AP[Hibiscus:2.1] SZ[19] ST[3] ;C[Black to play optimally. Please consider each move very carefully. Warning difficult problem! ] PL[B] AB[bc][bd][bf][bg][cc][cg][dd][de][df][ec][ed][fd][fq][gc][hp][io][jm][jn][jp][me][ne][no][od][oo][oq][pd][pj][pk][pl][pm][pn][pq][qd][qj] AW[bh][cb][cd][ce][cf][ch][db][dc][dg][dn][dp][eb][eg][fb][fc][gd][go][hc][ho][il][im][in][nd][oc][pc][po][pp][qc][qk][ql][qm][qn][qq][qr] (;B[jj] MN[1] ;W[jk] C[A good beginning but now what?] (;B[dh] ;W[di] ;B[ij] (;W[hi] (;B[kk] ;W[hj] C[Now how to finish playing in the centre?] (;B[fh] ;W[eh] ;B[ih] C[RIGHT Black is leading.] )(;B[ih] C[RIGHT] ;W[hh] ;B[ig] C[Almost 100 %] ))(;B[hj] ;W[kk] ;B[fj] ;W[eh] (;B[li] ;W[ek] C[Good for white.] )(;B[ek] ;W[kj] )))(;W[kk] ;B[eh] ;W[ei] ;B[fh] ;W[fi] ;B[gh] ;W[gi] ;B[ge] ;W[hd] ;B[hi] ;W[gk] ;B[li] C[Black is leading] ))(;B[kk] ;W[ij] ;B[ji] ;W[ii] ;B[jh] ;W[dq] C[Black can actually do better than this] ))(;B[jl] ;W[jk] ;B[kk] ;W[jj] ;B[kj] ;W[ji] C[White is getting too big a moyo on the left.] )(;B[kk] ;W[jj] ;B[kj] ;W[ji] C[White is too big on the left.] )(;B[jk] ;W[ij] ;B[jj] ;W[ii] C[White is leading.] ))