Usually black would create a ladder in this sort of situation, but even if the standard ladder doesn’t work, there are other possibilities.
Black to play
(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
SO[http://gogameguru.com/]AW[ek][bm][cm][dn][co][cp][dp][cq]AB[bn][cn][bo][do][eo][ep][eq][iq]C[Black to play.
http://gogameguru.com/]
(;B[dm]
;W[en]
(;B[cl]
;W[bl]
;B[bk]
(;W[ck]
;B[dl]
;W[bj]
(;B[fm]
(;W[fn]
;B[gn]
;W[fo]
;B[go]
;W[fp]
;B[fq]
;W[gp]
;B[hp]
;W[gq]
;B[gr]C[RIGHT])
(;W[bp]
;B[fn]
;W[ao]
;B[em]LB[dk:C][an:A][dn:B]C[RIGHT. White will continue with A or B, but this result is satisfactory for black. Later black can push through with C.]))
(;B[dk]
;W[bp]
(;B[cj]
;W[ao]
;B[fn]
;W[em]
;B[fk]
;W[fm]
;B[gm]
;W[gn]
;B[fo]
;W[gl]
;B[hm]
;W[ej]C[Black can try to squeeze, but he can't hold white in.])
(;B[ak]
;W[ao]))
(;B[am]
;W[ak]
;B[fm]
;W[bp]
;B[fn]
;W[ao]
;B[em]LB[dk:B][al:A]C[RIGHT, but note that white can still connect under by playing A next, so black shouldn't have ataried on the first line. Black would prefer to atari at B later instead.]))
(;W[dl]
;B[em]
;W[fn]
;B[fm]
;W[gn]
;B[ck]C[RIGHT]))
(;B[bl]
(;W[cl]
;B[dl]
;W[ck]
;B[fm]
(;W[fn]
;B[gn]
;W[fo]
;B[go]
;W[fp]
;B[fq]
;W[gp]
;B[hp]
;W[gq]
;B[gr]C[RIGHT])
(;W[bp]
;B[fn]
;W[an]
;B[em]LB[dn:B][ao:A]C[RIGHT. White will continue with A or B, but this result is satisfactory for black.]))
(;W[dl]
;B[em]
;W[fn]
;B[fm]
;W[gn]
;B[cl]C[RIGHT]))
(;B[fn]
;W[em]
;B[dl]
;W[el]
(;B[dk]
;W[bp])
(;B[bl]
;W[cl]
;B[dk]
;W[ck])
(;B[cl]
;W[bl]
;B[ck]
;W[bk]))
(;B[dl]
;W[bp]
;B[fn]
;W[em]
;B[el]
;W[fm]
;B[gm]
;W[fl]
;B[fk]
;W[gl]
;B[hl]
;W[gk]C[This ladder doesn't work.])
(;B[em]
;W[fn]
;B[cl]
;W[bl]
;B[bk]
;W[ck]
(;B[dl]
;W[bj])
(;B[al]
;W[dl]
;B[am]
;W[cl]
;B[bj]
;W[an]
(;B[ak]
;W[bp]C[Black can escape along the edge with a heavy group, but white can still live easily in the corner and attack black's group.])
(;B[ao]C[Capturing like this is nearly always a mistake.]
;W[ak]C[Now white can throw in here too. Unless black has some stones that can help in the top left (unlikely), black's cutting stones will be captured now.])))
(;B[fm]
;W[em]
;B[dl]
;W[el]
;B[cl]
;W[bl]
;B[bk]
;W[ck])
(;B[el]
;W[dl]
;B[em]
;W[fn]
;B[cl]
;W[bl]
;B[dk]
;W[bk]))
(;B[en]
;W[dm]))