This is "White To Play -- find the worst move"! The group in the lower left is dead if White does not play at 1. It seems as if Black dies if White plays anywhere else but 1
(;AB[ra]AB[qa]AB[ab]AB[ac]AB[dc]AB[ec]AB[fe]AB[ge]AB[gg]AB[hh]AB[ig]AB[jg]AB[ji]AB[ij]AB[ik]AB[kj]AB[kk]AB[jl]AB[im]AB[km]AB[lm]AB[mo]AB[no]AB[pq]AB[oq]AB[sq]AB[sr]AB[qd]AB[qe]AB[of]AB[og]AB[mh]AB[ds]AB[cr]AB[cq]AB[cp]AB[ao]AB[bo]AB[co]AB[eo]AB[ep]AB[cm]AB[cl]AB[bl]AW[ii]AW[cs]AW[bs]AW[as]AW[ar]AW[br]AW[bp]AW[dr]AW[dq]AW[dp]AW[do]AW[dn]AW[dm]AW[cn]AW[bn]AW[bm]AW[am]AB[gm]AB[gn]C[http://harryfearnley.com/go/bestiary/brain_hurts.html - http://denisfeldmann.fr/bestiary3.htm - White to play and save the black stones in the SW corner (and, if Black tries then to use this opportunity, who wins the game ?]LB[jj:1]LB[jk:2]AB[mi]AP[goproblems]
(;W[jj];B[es]TR[er];W[er];B[fs];W[fr];B[gs];W[gr];B[hs];W[hr];B[is];W[ir];B[js];W[jr];B[ks];W[kr];B[ls];W[lr];B[ms];W[mr];B[ns];W[nr];B[os];W[or];B[ps];W[pr];B[qs];W[qr];B[rs];W[rr];B[ss];W[rq];B[sp];W[rp];B[so];W[ro];B[sn];W[rn];B[sm];W[rm];B[sl];W[rl];B[sk];W[rk];B[sj];W[rj];B[si];W[ri];B[sh];W[rh];B[sg];W[rg];B[sf];W[rf];B[se];W[re];B[sd];W[rd];B[sc];W[rc];B[sb];W[rb];B[sa];W[qb];B[pa];W[pb];B[oa];W[ob];B[na];W[nb];B[ma];W[mb];B[la];W[lb];B[ka];W[kb];B[ja];W[jb];B[ia];W[ib];B[ha];W[hb];B[ga];W[gb];B[fa];W[fb];B[ea];W[eb];B[da];W[db];B[ca];W[cb];B[ba];W[bb];B[aa];W[bc];B[ad];W[bd];B[ae];W[be];B[af];W[bf];B[ag];W[bg];B[ah];W[bh];B[ai];W[bi];B[aj];W[bj];B[ak];W[bk];B[al]TR[dl];W[dl];B[ck];W[dk];B[cj];W[dj];B[ci];W[di];B[ch];W[dh];B[cg];W[dg];B[cf];W[df];B[ce];W[de];B[cd];W[dd];B[cc];W[ed];B[fc];W[fd];B[gc];W[gd];B[hc];W[hd];B[ic];W[id];B[jc];W[jd];B[kc];W[kd];B[lc];W[ld];B[mc];W[md];B[nc];W[nd];B[oc];W[od];B[pc];W[pd];B[qc];W[pe];B[qf];W[pf];B[qg];W[pg];B[qh];W[ph];B[qi];W[pi];B[qj];W[pj];B[qk];W[pk];B[ql];W[pl];B[qm];W[pm];B[qn];W[pn];B[qo];W[po];B[qp];W[pp];B[qq];W[op];B[nq];W[np];B[mq];W[mp];B[lq];W[lp];B[kq];W[kp];B[jq];W[jp];B[iq];W[ip];B[hq];W[hp];B[gq];W[gp];B[fq];W[fp];B[eq];W[fo];B[en];W[fn];B[em];W[fm];B[el];W[fl];B[ek];W[fk];B[ej];W[fj];B[ei];W[fi];B[eh];W[fh];B[eg];W[fg];B[ef];W[ff];B[ee];W[gf];B[he];W[hf];B[ie];W[if];B[je];W[jf];B[ke];W[kf];B[le];W[lf];B[me];W[mf];B[ne];W[nf];B[oe];W[ng];B[oh];W[nh];B[oi];W[ni];B[oj];W[nj];B[ok];W[nk];B[ol];W[nl];B[om];W[nm];B[on];W[nn];B[oo];W[mn];B[lo];W[ln];B[ko];W[kn];B[jo];W[jn];B[io];W[in];B[ho];W[hn];B[go];W[hm];B[gl];W[hl];B[gk];W[hk];B[gj];W[hj];B[gi];W[hi];B[gh];W[ih];B[hg];W[jh];B[kg];W[kh];B[lg];W[lh];B[mg];W[li];B[mj];W[lj];B[mk];W[lk];B[ml];W[ll];B[mm];W[kl];B[jm]TR[ki];W[ki];B[bq]TR[jk];W[jk]
(;B[aq]TR[il];W[il];B[cs]C[We must again assume that after White's move, both players will do their best. The incredible idea behind the problem is to self-break a ladder, with a white stone preventing the sacrifice which would end it otherwise (it must be said that this is a Pyrrhic victory for Black, as he destroyed all his territory in the process and loses by three and a half point (Japanese counting) with a 5,5 komiRIGHT])
(;B[ap];W[il]C[RIGHT]))
(;W[jk];B[es];W[er];B[fs];W[fr];B[gs];W[gr];B[hs];W[hr];B[is];W[ir];B[js];W[jr];B[ks];W[kr];B[ls];W[lr];B[ms];W[mr];B[ns];W[nr];B[os];W[or];B[ps];W[pr];B[qs];W[qr];B[rs];W[rr];B[ss];W[rq];B[sp];W[rp];B[so];W[ro];B[sn];W[rn];B[sm];W[rm];B[sl];W[rl];B[sk];W[rk];B[sj];W[rj];B[si];W[ri];B[sh];W[rh];B[sg];W[rg];B[sf];W[rf];B[se];W[re];B[sd];W[rd];B[sc];W[rc];B[sb];W[rb];B[sa];W[qb];B[pa];W[pb];B[oa];W[ob];B[na];W[nb];B[ma];W[mb];B[la];W[lb];B[ka];W[kb];B[ja];W[jb];B[ia];W[ib];B[ha];W[hb];B[ga];W[gb];B[fa];W[fb];B[ea];W[eb];B[da];W[db];B[ca];W[cb];B[ba];W[bb];B[aa];W[bc];B[ad];W[bd];B[ae];W[be];B[af];W[bf];B[ag];W[bg];B[ah];W[bh];B[ai];W[bi];B[aj];W[bj];B[ak];W[bk];B[al];W[dl];B[ck];W[dk];B[cj];W[dj];B[ci];W[di];B[ch];W[dh];B[cg];W[dg];B[cf];W[df];B[ce];W[de];B[cd];W[dd];B[cc];W[ed];B[fc];W[fd];B[gc];W[gd];B[hc];W[hd];B[ic];W[id];B[jc];W[jd];B[kc];W[kd];B[lc];W[ld];B[mc];W[md];B[nc];W[nd];B[oc];W[od];B[pc];W[pd];B[qc];W[pe];B[qf];W[pf];B[qg];W[pg];B[qh];W[ph];B[qi];W[pi];B[qj];W[pj];B[qk];W[pk];B[ql];W[pl];B[qm];W[pm];B[qn];W[pn];B[qo];W[po];B[qp];W[pp];B[qq];W[op];B[nq];W[np];B[mq];W[mp];B[lq];W[lp];B[kq];W[kp];B[jq];W[jp];B[iq];W[ip];B[hq];W[hp];B[gq];W[gp];B[fq];W[fp];B[eq];W[fo];B[en];W[fn];B[em];W[fm];B[el];W[fl];B[ek];W[fk];B[ej];W[fj];B[ei];W[fi];B[eh];W[fh];B[eg];W[fg];B[ef];W[ff];B[ee];W[gf];B[he];W[hf];B[ie];W[if];B[je];W[jf];B[ke];W[kf];B[le];W[lf];B[me];W[mf];B[ne];W[nf];B[oe];W[ng];B[oh];W[nh];B[oi];W[ni];B[oj];W[nj];B[ok];W[nk];B[ol];W[nl];B[om];W[nm];B[on];W[nn];B[oo];W[mn];B[lo];W[ln];B[ko];W[kn];B[jo];W[jn];B[io];W[in];B[ho];W[hn];B[go];W[hm];B[gl];W[hl];B[gk];W[hk];B[gj];W[hj];B[gi];W[hi];B[gh];W[ih];B[hg];W[jh];B[kg];W[kh];B[lg];W[lh];B[mg];W[li];B[mj];W[lj];B[mk];W[lk];B[ml];W[ll];B[mm];W[kl];B[jm]
(;W[ki];B[bq];W[il]C[RIGHT])
(;W[il]C[RIGHT])))