(;C[Black plays, and white has (L)ife, (S)eki, (K)o, or (D)eath?FORCE]AB[fc]AW[gb]AB[jd]AW[jb]AW[rc]AW[qg]AB[cb]AB[cc]AW[db]AB[dd]AB[ec]AW[fb]AW[gc]AB[fe]AB[gd]AB[id]AW[ib]AW[ic]AB[jc]AW[lb]AB[mb]AB[mc]AB[ld]AW[rb]AW[ra]LB[if:L]LB[kf:S]LB[mf:K]LB[of:D]AW[pd]AW[qe]AP[goproblems]
(;B[kf];W[kf]AB[kf]C[Prove it.]
(;B[ha];W[eb]C[]
(;B[da];W[ea]
(;B[ga];W[ma]
(;B[ob];W[na]
(;B[pc];W[kc]
(;B[lc];W[la]
(;B[kb];W[ka]
(;B[ia]C[Well done!RIGHT])
(;B[kd]C[NOTTHIS])
(;B[hc]C[NOTTHIS])
(;B[hb]C[NOTTHIS]))
(;B[ia];W[kb];B[ja];W[hb]C[White captures a living shape.])
(;B[hc]C[NOTTHIS])
(;B[hb]C[NOTTHIS]))
(;B[ka];W[la]C[No way to stop white from making 2 eyes now.])
(;B[kd];W[lc]C[No way to stop white from making 2 eyes now.])
(;B[ia];W[lc]C[No way to stop white from making 2 eyes now.])
(;B[hc]C[NOTTHIS])
(;B[hb]C[NOTTHIS]))
(;B[oa];W[nb];B[nc];W[la]
(;B[oc];W[kb])
(;B[pc];W[kb])
(;B[od];W[kb]))
(;B[nb];W[oa];B[pa];W[la]
(;B[pb];W[kb])
(;B[pc];W[kb])
(;B[qb];W[kb]))
(;B[hc]C[NOTTHIS])
(;B[hb]C[NOTTHIS]))
(;B[na];W[la]
(;B[nb];W[kb])
(;B[ob];W[kb])
(;B[nc];W[kb]))
(;B[nb];W[na]
(;B[oa];W[la]
(;B[ob];W[kb])
(;B[pb];W[kb])
(;B[oc];W[kb]))
(;B[ob];W[oa];B[pa];W[la]
(;B[pb];W[kb])
(;B[pc];W[kb])
(;B[qb];W[kb])))
(;B[hc]C[NOTTHIS])
(;B[hb]C[NOTTHIS]))
(;B[kc];W[ga])
(;B[kb];W[kc])
(;B[lc];W[kb]
(;B[ga];W[la])
(;B[la];W[ga]))
(;B[la];W[ka])
(;B[hb]C[NOTTHIS])
(;B[hc]C[NOTTHIS]))
(;B[ga];W[da];B[fa];W[kb]
(;B[la];W[ka];B[ia];W[hb]C[White captures a living shape])
(;B[ia];W[la];B[ja];W[hb]C[white captures a living shape]))
(;B[ia];W[ga])
(;B[la];W[ka]
(;B[ia];W[ga])
(;B[da];W[ia]))
(;B[hb]C[NOTTHIS])
(;B[hc]C[NOTTHIS]))
(;B[eb];W[ha])
(;B[hc];W[ha])
(;B[la];W[ha])
(;B[kc];W[ha]))
(;B[mf]C[No ko here.])
(;B[of]C[Black cannot quite kill this.])
(;B[if]C[Black can do more than that.]))