I was looking at problem 17424 and thought of something interesting...
(;AW[eq]AW[er]AW[bq]AB[cm]AB[gp]AB[fr]AW[fq]AW[ep]AW[eo]AW[fo]AW[dn]AW[dm]AB[cl]AB[en]AB[fn]AB[go]AW[gn]AB[fm]AW[hn]AB[do]AB[dp]AB[ck]AB[fp]AB[gq]AB[hq]AB[ip]AB[ho]AW[in]AB[gm]AB[cp]AB[bo]AB[cn]AW[gk]AW[gl]AW[jk]AW[el]AW[dl]AW[ek]AB[jo]AB[jq]AB[cj]C[What can black do here?]AP[goproblems]
(;B[es]
(;W[ds]
(;B[gs]
(;W[cr]
(;B[dr];W[dq];B[cq];W[dr];B[br]C[Well done!CHOICERIGHT])
(;B[fs];W[dr])
(;B[dq];W[dr])
(;B[bs];W[dr])
(;B[cq];W[dr]))
(;W[fs]C[This branch is to demonstrate the ko being played out, and will not be chosen by the applet when solving.];B[hm]
(;W[im];B[es];W[cr];B[dr];W[fs];B[hl];W[hk];B[es];W[dq];B[cq];W[fs];B[il];W[jl];B[es];W[dr];B[br];W[fs];B[ik];W[ij];B[es]C[:)RIGHT])
(;W[gr];B[jm]C[:)RIGHT])))
(;B[dr];W[fs];B[dq];W[gr])
(;B[fs];W[gr])
(;B[dq];W[fs]
(;B[dr])
(;B[gr];W[cr]))
(;B[gr];W[cr]))
(;W[gr];B[dr];W[fs];B[ds]C[RIGHT])
(;W[dr];B[cr];W[ds];B[dq];W[fs];B[gr]C[RIGHT]))
(;B[dr];W[es]
(;B[dq];W[gr];B[ds];W[fs];B[hs];W[hr];B[ir];W[hm])
(;B[gr];W[dq];B[cq];W[cr];B[br];W[ds];B[bs];W[ar])
(;B[ds];W[gr];B[dq]))
(;B[dq];W[gr]
(;B[es];W[fs];B[dr];W[ds])
(;B[dr];W[fs];B[ds];W[es]))
(;B[gr];W[cr])
(;B[hm];W[im]C[Too early to be doing that.])
(;B[im];W[hm])
(;B[jm];W[hm])
(;B[il];W[hm])
(;B[hl];W[hm])
(;B[jn];W[hm])
(;B[cr];W[gr]))