(;AB[cd]AW[ec]AB[gc]AW[de]AW[ed]AW[fe]AW[gd]AW[he]AW[ie]AB[dd]AB[ee]AB[ef]AB[hd]AB[id]AB[jd]AW[be]AB[cb]AW[ce]AB[eb]AW[dc]AB[cc]AW[db]AB[fc]AB[da]AW[fd]AB[ea]AB[hc]AW[fb]AW[gb]AW[ff]AB[eg]AW[bc]AB[ba]AW[bd]AB[hb]AW[ch]AB[fg]AW[hg]AB[hh]AW[gg]AB[gh]AW[ig]AB[gf]AW[ge]AW[pd]AB[nc]AW[oe]AB[ih]AW[jg]AW[kg]AB[jh]AB[mg]AW[lh]AB[mh]AW[li]AW[md]AB[nd]AW[ne]AB[me]AW[mc]AB[mb]AW[lb]AB[nb]AW[le]AB[mf]AW[ld]AB[lg]AW[kh]AB[qc]AB[ob]AW[ma]AW[je]TR[pd]TR[oe]TR[ne]C[The marked stones are dead, how to get back?? Do your best with the B19 group! Comments are welcome!!]AB[ke]AW[kf]AB[kd]AB[kc]AW[lf]AB[oh]AB[qg]AW[lc]LB[ba:kill]AP[goproblems]
(;W[jb];B[kb];W[ka];B[ib]
(;W[jc];B[ia]
(;W[ga];B[ja];W[la]C[RIGHT])
(;W[ja];B[ga]))
(;W[ja];B[jc])
(;W[ia]
(;B[jc];W[ha];B[ja]C[ko... not the best solution!])
(;B[ha];W[jc];B[ja]C[ko.])))
(;W[ia];B[ib]
(;W[jb];B[jc];W[ha];B[kb];W[ka];B[ja])
(;W[ha];B[ja])
(;W[ja];B[jb]))
(;W[ja];B[ib])
(;W[kb];B[jb])
(;W[ka];B[jb])
(;W[bb];B[jb]
(;W[ca];B[cb])
(;W[ab];B[ga];W[aa];B[fa];W[ca]C[still alive.]))
(;W[fa];B[ga])
(;W[ga];B[ha];W[jb];B[fa];W[gb];B[kb];W[ka];B[ib];W[jc];B[ja];W[ia];B[ic])
(;W[ha];B[ga]))