(;AW[jc]AW[ic]AB[ib]AW[gd]AB[jb]AB[hc]AB[hb]AB[ga]AW[gb]AW[eb]AW[ec]AW[gc]AW[ea]AW[hd]AB[id]AB[ie]AB[if]AW[ig]AW[he]AW[hf]AB[hg]AB[gg]AB[gf]AB[ge]AW[ee]AB[hi]AW[kc]AW[kb]AB[kd]AB[jd]AW[ji]AW[jf]AB[jg]AB[kg]AW[ih]AB[nc]AW[li]AB[mg]AW[pf]AW[qc]AB[kf]TR[kb]TR[kc]TR[jc]TR[ic]C[Black to capture the marked stones.]AP[goproblems]
(;B[ld];W[ja])
(;B[mb];W[ja])
(;B[mc];W[ja])
(;B[md];W[ja])
(;B[ja];W[ka])
(;B[ia];W[ka])
(;B[lb];W[lc]
(;B[ka];W[ld]
(;B[le];W[mb])
(;B[ke];W[mb]))
(;B[mc];W[ld]
(;B[ka];W[ke])
(;B[ke];W[mb])
(;B[le];W[mb]))
(;B[mb];W[ld]
(;B[ke];W[ja])
(;B[le];W[ja])
(;B[ka];W[ke]))
(;B[ld];W[mb])
(;B[la];W[ld]
(;B[ka];W[ke])
(;B[ke];W[ka])
(;B[le];W[ka])))
(;B[lc];W[lb]
(;B[mc];W[ja])
(;B[mb];W[ld]
(;B[mc];W[ke])
(;B[md];W[mc]MA[lc]
(;B[la];W[ke])
(;B[ka];W[ke])
(;B[le];W[ja])
(;B[ke]))
(;B[ke];W[mc])
(;B[le];W[mc]
(;B[md];W[ja])
(;B[la];W[ja])
(;B[ka];W[la]))
(;B[la];W[mc];B[ka];W[lc]
(;B[le];W[md]
(;B[me];W[nd];B[od];W[ne])
(;B[ne];W[nb])
(;B[nd];W[me]
(;B[mf];W[ne])
(;B[nf];W[nb])
(;B[ne];W[mf];B[nf]C[RIGHT])))
(;B[md];W[le]TR[ke]TR[nb]))
(;B[ka];W[mc];B[la];W[lc]
(;B[md];W[le]TR[ke]TR[nb])
(;B[le];W[md]
(;B[me];W[nd];B[od];W[ne])
(;B[nd];W[me];B[ne];W[mf];B[nf]C[RIGHT])))))
(;B[la];W[ja];B[ka];W[lb]
(;B[ma];W[mb];B[ia];W[nb])
(;B[ia];W[mb]
(;B[ma];W[nb])
(;B[nb];W[ma]
(;B[mc];W[fa]C[White at least has ko.])
(;B[na];W[fa]C[White at least has ko.])
(;B[lc];W[ja];B[ka];W[ld]))))
(;B[ka];W[lc]
(;B[ld];W[la])
(;B[mc];W[ld]
(;B[ke];W[la])
(;B[le];W[la])
(;B[lb];W[ke]))
(;B[mb];W[la])
(;B[la];W[mb]
(;B[ma];W[nb];B[ob];W[na])
(;B[nb];W[ma];B[ld];W[lb];B[ia];W[ja];B[ka];W[fa];B[mc];W[ha]MA[ga]))
(;B[ma];W[mb];B[nb];W[la]C[ko])))