(;AB[pp]AW[or]AW[qq]AB[qp]AW[pq]AB[lr]AB[lq]AB[lp]AB[lo]AB[ln]AB[lm]AW[kr]AW[kq]AW[kp]AW[ko]AB[jp]AB[jn]AB[im]AB[iq]AB[hq]AB[gp]AB[fp]AB[ep]AB[eq]AB[er]AB[es]AW[gq]AW[fq]AW[fr]AW[fs]AW[hr]AW[ir]TR[kr]TR[kq]TR[kp]TR[ko]C[Black to kill the marked stones]AP[goproblems]
(;B[ks];W[js]
(;B[hs]
(;W[is];B[gs];W[gr]
(;B[ls]C[RIGHT])
(;B[jq];W[ls];B[mr]C[RIGHT])
(;B[mr]C[works (see comment by Bass)RIGHT]))
(;W[ls]
(;B[ms];W[mr];B[ks])
(;B[mr]C[RIGHT]
(;W[jq];B[gr]C[RIGHT])
(;W[is];B[gs];W[gr];B[jq]C[RIGHT]))))
(;B[jq];W[ls];B[mr];W[gs];B[jr];W[is])
(;B[ls];W[gs])
(;B[gs];W[ls];B[mr];W[jq]))
(;B[hs]
(;W[ks]
(;B[ls];W[is];B[gs];W[gr]C[CHOICE])
(;B[gr];W[is];B[gs];W[ls]))
(;W[ls]C[mistake by white]
(;B[mr];W[ms];B[ns];W[ks];B[nr];W[is];B[gs];W[gr])
(;B[ms];W[ks]
(;B[nr];W[is];B[gs];W[gr])
(;B[mr];W[is];B[gs];W[gr])
(;B[mq];W[is];B[gs];W[gr]))))
(;B[gs];W[ls]
(;B[ms];W[ks];B[mr];W[gr];B[is];W[js];B[jq];W[jr]C[black cannot play h1 to reduce white's eye-space])
(;B[mr]
(;W[ms]C[White connects out (and the throw in at L1 will not help you)CHOICE])
(;W[gr]C[wrong play by white (thanks to piccolo)
If white plays this while you are trying to solve the problem I have messed up with the interface.];B[is];W[js];B[jq];W[jr]C[black cannot fill in at h1])))
(;B[jr];W[ls]
(;B[ms];W[ks];B[mr];W[jq];B[hs];W[is];B[gs];W[gr])
(;B[mr];W[ks];B[ms];W[jq];B[hs];W[is];B[gs];W[gr])
(;B[js];W[jq];B[hs];W[ks];B[gr];W[is];B[gs])
(;B[ks];W[js]
(;B[jq];W[mr])
(;B[ms];W[jq];B[hs];W[is];B[gs];W[gr];B[ks])))
(;B[is];W[js]
(;B[gs];W[gr]C[black cannot fill at h1])
(;B[ls];W[hs]))
(;B[ls];W[ks]
(;B[jq];W[jr])
(;B[jr];W[jq];B[gs];W[gr];B[is];W[js])
(;B[js];W[jr])
(;B[is];W[hs]
(;B[jr];W[jq];B[gs];W[js])
(;B[gs];W[jq]
(;B[js];W[gr])
(;B[gr];W[js])))
(;B[hs];W[is];B[gs];W[gr])
(;B[gs];W[gr];B[is];W[js]C[black cannot fill in at h1]))
(;B[js];W[ks]
(;B[hs];W[ls]C[white escaped]TR[ko]TR[kp]TR[kq]TR[kr])
(;B[jr];W[ls]TR[ko]TR[kp]TR[kq]TR[kr]C[The marked stones connect out.]))
(;B[jq];W[ls]
(;B[mr];W[jr];B[hs];W[is];B[gs];W[ks];B[gr];W[ms]TR[kr]TR[kq]TR[kp]TR[ko]C[those were not the stones you wanted to capture])
(;B[ms];W[jr];B[ks];W[gs])))