From a 9d game on Tygem. Black only saw that he could kill these stones after the game, unfortunately.
(;AW[gq]AW[gp]AW[dq]AW[cp]AB[dp]AB[fp]AB[im]AB[il]AB[ik]AW[jk]AW[kl]AB[jj]AB[kj]AB[ji]AB[jh]AB[kh]AB[jg]AB[ig]AB[ih]AB[hh]AB[gh]AW[ij]AW[ii]AW[hi]AW[gi]AW[hk]AW[hl]AB[fi]AB[fj]AW[fh]AW[fg]AW[gg]AW[hg]AW[ff]AW[dg]AB[eh]AW[ei]AB[ee]AB[fe]AB[hf]AB[he]AB[gc]AW[if]AW[jf]AW[id]AW[jd]AB[kf]AW[kg]AW[lg]AW[lh]AW[li]C[Black to kill the marked stones to connect.]TR[gi]TR[hi]TR[ii]TR[ij]AW[jl]AW[df]AP[goproblems]
(;B[hj];W[gj]
(;B[gk];W[hj]
(;B[gl];W[hm]
(;B[hn];W[gm]
(;B[fm];W[gn]
(;B[go];W[fn];B[en]C[Ladder, good!RIGHT])
(;B[fn];W[go]))
(;B[gn];W[fm]))
(;B[gn];W[hn])
(;B[gm];W[hn]))
(;B[gm];W[fk];B[ej];W[gl])
(;B[hm];W[gl];B[fl];W[gm];B[gn];W[fm];B[em];W[fn]
(;B[fo];W[fk])
(;B[en];W[fk])))
(;B[hm];W[fk])
(;B[fk];W[gm])
(;B[gm];W[fk]))
(;B[gk];W[hj]C[This was the move played in the actual game, black lost soon after this point.]
(;B[gm];W[lj])
(;B[hm];W[gl]
(;B[fl];W[gm];B[gn];W[fm];B[em];W[fn])
(;B[gm];W[fl])))
(;B[gm];W[fk]
(;B[gk];W[gl]
(;B[fl];W[gj])
(;B[gj];W[hj];B[ej];W[fm]))
(;B[gj];W[hj]
(;B[gk];W[gl];B[ej];W[fm])
(;B[ej];W[fl]))
(;B[ej];W[fl])
(;B[hj];W[gj]))
(;B[hm];W[fk]
(;B[gk];W[gl];B[gj];W[hj])
(;B[gj];W[hj]
(;B[fl];W[ej])
(;B[ej];W[fl])
(;B[gk];W[gl])))
(;B[gj];W[hj]
(;B[gm];W[lj])
(;B[hm];W[fk]
(;B[fl];W[ej])
(;B[ej];W[fl]))))