Problem	11081
Created	2008-03-19
Source	Problem 11026
Rating

Difficulty	9 dan
Average Solve Time	111 secs
User Attempts	34 / 283
Solve Ratio Rating	2 dan
	rating history

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]))