In problem 11026 the moves 1 to 3 were supposed to kill Black. But the continuation is not really trivial. Assume there are no really big points or ko threats anywhere else.
(;AW[mr]AW[nq]AW[or]AW[qq]AB[rp]AB[qo]AB[po]AB[op]AB[np]AW[mp]AB[mq]AB[lq]AB[kq]AB[kr]AB[jr]AB[iq]AB[is]AB[hs]AB[hr]AB[hq]AB[gr]AW[gs]AW[fs]AW[fr]AW[fq]AW[gq]AW[hp]AW[ip]AW[jp]AW[jq]AW[kp]AW[lp]AW[ks]AB[rn]AB[ls]AW[lr]AB[nr]C[Black somehow does not agree to being killed outright. Now do what is best.]LB[ks:1]LB[ls:2]LB[lr:3]LB[nr:4!]AP[goproblems]
(;W[ns];B[pr]
(;W[pq];B[oq]
(;W[nr];B[ps]
(;W[qr];B[rq]
(;W[rr];B[sr]
(;W[qs];B[pp]
(;W[ms];B[qp]
(;W[os];B[pr]
(;W[ps];B[rs]
(;W[ls];B[sq];W[ss]C[Ko, White kills Black or lives in seki.RIGHT])
(;W[ss];B[sq]
(;W[rs]C[Just seki.])
(;W[ls];B[rs]C[Ko, but White has to find the first threat]))
(;W[sq];B[sp]
(;W[ls];B[sq];W[ss]C[Ko, White kills Black or lives in seki.RIGHT])
(;W[ss];B[sq]
(;W[ls];B[rs]C[Ko, but White has to find the first threat])
(;W[rs]C[Just seki.]))))
(;W[ls];B[rs]
(;W[ps];B[sq];W[ss]C[Ko, White kills Black or lives in seki.RIGHT])
(;W[ss];B[sq];W[ps];B[rs]C[Ko, but White has to find the first threat])
(;W[js];B[ps])
(;W[sq];B[ps]))
(;W[ss];B[sq]
(;W[ls];B[rs];W[ps];B[ss]C[Just seki])
(;W[ps];B[rs]C[Ko, but White has to find the first threat and ignore one Black threat.]))
(;W[rs]C[Just seki.])
(;W[sq]C[NOTTHIS]))
(;W[ls];B[rs])
(;W[rs];B[ss])
(;W[sq];B[rs]))
(;W[os];B[qp]
(;W[ms];B[pr]
(;W[ps];B[rs]
(;W[ls];B[sq];W[ss]C[Ko, White kills Black or lives in seki.RIGHT])
(;W[ss];B[sq]
(;W[rs]C[Just seki.])
(;W[ls];B[rs]C[Ko, but White has to find the first threat]))
(;W[sq];B[sp]
(;W[ls];B[sq];W[ss]C[Ko, White kills Black or lives in seki.RIGHT])
(;W[ss];B[sq]
(;W[ls];B[rs]C[Ko, but White has to find the first threat])
(;W[rs]C[Just seki.]))))
(;W[ls];B[rs]
(;W[ps])
(;W[ss];B[sq];W[ps])
(;W[js];B[ps])
(;W[sq];B[ps]))
(;W[ss];B[sq]
(;W[ls];B[rs];W[ps];B[ss]C[Just seki])
(;W[ps];B[rs]C[Ko, but White has to find the first threat and ignore one Black threat.]))
(;W[rs]C[Just seki.])
(;W[sq]C[NOTTHIS]))
(;W[rs]C[Just seki.];B[pr]
(;W[ps];B[sq];W[ms]C[Seki])
(;W[ms]C[Seki]))
(;W[ss];B[sq]
(;W[ms];B[rs]C[Ko, White has to find the first threat.])
(;W[rs]C[Just seki.])
(;W[ps];B[rs]C[Ko, White has to find the first threat and ignore some of Black threats to win.])
(;W[pr];B[rs]C[Ko, White has to find the first threat and ignore some of Black threats to win.]))
(;W[pr];B[ss]C[Just seki.])
(;W[ps];B[ss]C[Just seki.])
(;W[sq]C[NOTTHIS]))
(;W[rs]C[Just seki.])
(;W[ss];B[sq]
(;W[rs];B[qp])
(;W[os];B[rs]C[Ko, White has to find the first threat and ignore some of Black threats to win.])
(;W[ms];B[rs]C[Ko, White has to find the first threat and ignore some of Black threats to win.]))
(;W[sq]C[NOTTHIS]))
(;W[ms];B[rs];W[qs];B[pp];W[os];B[pr];W[ls];B[qp]
(;W[ps])
(;W[ss];B[sq];W[ps])
(;W[js];B[ps])
(;W[sq];B[ps]))
(;W[rs]C[Just seki.];B[qp]
(;W[qs];B[pp]
(;W[os];B[pr]
(;W[ps];B[sq];W[ms]C[Seki])
(;W[ms]C[Seki]))
(;W[ms]))
(;W[ms];B[pp])
(;W[sq];B[pp]C[Living like a dodo.]))
(;W[qp];B[rs])
(;W[pp];B[rs])
(;W[ss];B[sq]
(;W[rs];B[pp])
(;W[ms];B[qp]
(;W[ls];B[rs])
(;W[rs])
(;W[qs];B[rs]C[Ko, White needs to find the first threat and ignore several Black threats.]))
(;W[qs];B[rs]C[Ko, White needs to find the first threat and ignore several Black threats.]))
(;W[sq]C[NOTTHIS]))
(;W[qs];B[rr]
(;W[rs];B[sr]
(;W[ms];B[ss]
(;W[ls];B[pp];W[os];B[pr];W[ps];B[qp]C[Seki.])
(;W[os];B[pp];W[ls];B[pr];W[ps];B[qp]C[Seki.]))
(;W[os];B[pp];W[ms];B[qp];W[ls];B[pr];W[ps];B[ss]C[Seki]))
(;W[ms];B[rs]
(;W[os];B[pp];W[ls];B[pr]C[Seki])
(;W[ls];B[pp];W[os];B[pr]C[Seki]))
(;W[os];B[rs];W[ms];B[pp];W[ls];B[pr]C[Seki]))
(;W[ms];B[rr]
(;W[ls];B[qs])
(;W[rs];B[qp]
(;W[qs];B[pp]
(;W[os];B[sr];W[ls];B[pr];W[ps];B[ss]C[Seki])
(;W[ls];B[ss]))
(;W[os];B[ls])
(;W[ls];B[pp]))
(;W[qs];B[rs]
(;W[os];B[pp];W[ls];B[pr]C[Seki])
(;W[ls];B[pp];W[os];B[pr]C[Seki])))
(;W[rs]
(;B[rr]
(;W[sr];B[qp]
(;W[sq];B[pp])
(;W[qs];B[sq];W[os];B[ss]C[Ko, White needs to find the first threat and ignore several Black threats.])
(;W[ms];B[pp]))
(;W[qs];B[sr]
(;W[ms];B[ss]
(;W[ls];B[pp];W[os];B[pr];W[ps];B[qp]C[Seki.])
(;W[os];B[pp];W[ls]))
(;W[os];B[pp];W[ms];B[qp];W[ls];B[pr];W[ps];B[ss]C[Seki]))
(;W[ms];B[qp]
(;W[qs];B[pp]
(;W[os];B[sr])
(;W[ls];B[ss]))
(;W[os];B[ls])
(;W[ls];B[pp])))
(;B[sr]
(;W[qs];B[rr];W[ms];B[ss]
(;W[ls];B[pp];W[os];B[pr];W[ps];B[qp]C[Seki.])
(;W[os];B[pp];W[ls]))
(;W[rr];B[qp]
(;W[qs];B[pp]
(;W[os];B[pr]
(;W[ps];B[sq];W[ms]C[Seki])
(;W[ms]C[Seki]))
(;W[ms];B[ss]))
(;W[ms];B[pp])
(;W[sq];B[pp]C[Living like a dodo.]))
(;W[ms];B[rr]
(;W[qs];B[ss]
(;W[ls];B[pp];W[os];B[pr];W[ps];B[qp]C[Seki.])
(;W[os];B[pp];W[ls]))
(;W[ls];B[qp];W[qs];B[ss];W[os];B[pr]C[Seki])))))
(;W[qs];B[qr]
(;W[rr];B[rs];W[rq];B[sq]
(;W[sr];B[qp]
(;W[sp];B[pp]C[White dies])
(;W[ms]C[White is dead, really.])
(;W[ss];B[pp]))
(;W[ms];B[sr])
(;W[sp];B[qp];W[sr];B[pp]C[White dies]))
(;W[rq];B[rr]
(;W[sr];B[rs]
(;W[ms];B[os])
(;W[sq];B[os]))
(;W[rs];B[ss])
(;W[sq];B[os])
(;W[ms];B[os]))
(;W[ms];B[rr]))
(;W[rr];B[os])
(;W[rq];B[os])
(;W[ms];B[os]))
(;W[qr];B[nr]C[Ko, White needs to find the first threat])
(;W[ms];B[nr]C[Ko, White needs to find the first threat and ignore several Black threats.])
(;W[os];B[nr]C[Ko, White needs to find the first threat and ignore several Black threats.])
(;W[ps];B[nr]C[Ko, White needs to find the first threat and ignore several Black threats.])
(;W[qs];B[nr]C[Ko, White needs to find the first threat and ignore several Black threats.]))
(;W[oq];B[pq]
(;W[ps];B[qs]
(;W[qr];B[os]C[Ko, White needs to find the first threat.])
(;W[os];B[qr]C[Just seki.])
(;W[ms];B[os]C[Ko, White needs to find the first threat just to get seki.])
(;W[pp];B[os]C[Ko, White needs to find the first threat just to get seki]))
(;W[os];B[ps]C[Just seki])
(;W[ms];B[ps]
(;W[os]C[Just seki.])
(;W[ls];B[os])))
(;W[ms];B[oq]
(;W[nr];B[ps];W[pq];B[os])
(;W[pq];B[nr]C[Ko, White needs to find the first threat and ignore several Black threats.])
(;W[os];B[pq])
(;W[ps];B[nr]C[Ko, White needs to find the first threat.];W[os];B[qs];W[nq];B[qr])
(;W[qr];B[nr]C[Ko, White needs to find the first threat and ignore several Black threats.])
(;W[ls];B[nr]C[Ko, White needs to find the first threat.]))
(;W[nr];B[pq])
(;W[os];B[oq]
(;W[pq];B[ps]
(;W[qr];B[nr]C[Ko, White needs to find the first threat.])
(;W[ms];B[nr]C[Ko, White needs to find the first threat.]))
(;W[ms];B[pq])
(;W[nr];B[ps]))
(;W[qr];B[oq]
(;W[pq];B[nr]C[Ko, White needs to find the first threat])
(;W[nr];B[pq];W[ps];B[rr]))
(;W[ps];B[oq]
(;W[nr];B[qs]
(;W[qr];B[os]C[Ko, White needs to find the first threat.])
(;W[pq];B[os]C[Ko, White needs to find the first threat and ignore several Black threats.])
(;W[ms];B[qr]))
(;W[ms];B[nr]C[Ko, White needs to find the first threat.];W[os];B[qs];W[nq];B[qr])
(;W[qr];B[nr]C[Ko, White needs to find the first threat.])))
(;W[ms];B[oq]
(;W[ns];B[pr]
(;W[nq];B[ps]
(;W[pq];B[os])
(;W[os];B[pq])
(;W[ls];B[os])
(;W[nr];B[os]))
(;W[ps];B[qs];W[nq];B[os]C[White dies with a double ko.])
(;W[os];B[ps]
(;W[nq];B[pq])
(;W[pq];B[ls]))
(;W[pq];B[os]))
(;W[os];B[pr]
(;W[ns];B[ps]
(;W[nq];B[pq])
(;W[pq];B[ls]))
(;W[ps];B[qs])
(;W[qr];B[ps])
(;W[pq];B[ps]))
(;W[js];B[ls]
(;W[ks];B[ns])
(;W[ns];B[os])))
(;W[oq];B[ms])
(;W[os];B[ms]))