(;SZ[19]AB[or]AB[oq]AB[pq]AB[rq]AB[sr]AB[rs]AB[rn]AB[rm]AB[np]AB[oo]AB[mn]AB[pl]AB[ql]AB[rk]AB[om]AB[nl]AB[lm]AB[ln]AB[pj]AB[qk]AB[os]AB[jr]AB[ir]AB[qq]AB[nm]AB[pi]AB[hq]AB[gq]AB[io]AB[in]AB[jm]AB[kl]AB[hm]AB[gn]AB[fo]AB[ep]AB[eq]AB[ll]AB[nk]AB[ph]AB[fq]AB[kj]AB[lj]AB[em]AB[gl]AB[gk]AB[fj]AB[ek]AB[dl]AB[hj]AB[hi]AB[fi]AB[ei]AB[ck]AB[bl]AB[dn]AB[do]AB[am]AB[bn]AB[dp]AB[bp]AB[ap]AB[ar]AB[cr]AB[bs]AB[gr]AB[hs]AB[js]AB[mr]AB[ms]AB[jj]AB[nh]AB[nf]AB[ld]AB[gs]AB[qi]AB[rh]AB[sk]AB[qh]AB[pf]AB[qf]AB[qg]AB[qe]AB[pd]AB[oe]AB[mp]AB[lp]AB[oc]AB[kp]AB[mc]AB[jp]AB[ob]AB[mh]AB[bh]AB[de]AB[gc]AB[hc]AB[ec]AB[eb]AB[fc]AB[cg]AB[dc]AB[ef]AB[ib]AB[gd]AB[df]AB[ig]AB[ce]AB[an]AW[lq]AW[mq]AW[nq]AW[nr]AW[op]AW[pp]AW[qp]AW[ro]AW[sp]AW[qn]AW[pn]AW[po]AW[qm]AW[ol]AW[kq]AW[pm]AW[ok]AW[mm]AW[ml]AW[pk]AW[jq]AW[kr]AW[ns]AW[oj]AW[iq]AW[hp]AW[gp]AW[hn]AW[im]AW[jl]AW[fp]AW[hl]AW[hk]AW[mk]AW[oi]AW[km]AW[eo]AW[dm]AW[fk]AW[gj]AW[jk]AW[gi]AW[ij]AW[ii]AW[fh]AW[gg]AW[ej]AW[eh]AW[cj]AW[en]AW[cm]AW[cn]AW[co]AW[cp]AW[dr]AW[dq]AW[cs]AW[er]AW[fr]AW[ch]AW[bj]AW[kh]AW[mg]AW[me]AW[kc]AW[mi]AW[mj]AW[fs]AW[pb]AW[qd]AW[rf]AW[ri]AW[qj]AW[rj]AW[sl]AW[rg]AW[sh]AW[re]AW[qc]AW[no]AW[mo]AW[ge]AW[jb]AW[ko]AW[nd]AW[lb]AW[ni]AW[li]AW[lo]AW[qa]AW[sf]AW[rd]AW[mf]AW[lg]AW[hd]AW[bc]AW[fd]AW[ab]AW[ba]AW[bf]AW[be]AW[bd]AW[ea]AW[da]AW[ai]AW[cf]AW[af]AW[fb]AW[ji]AW[hf]AW[eg]AW[ic]AW[cc]AW[cb]AW[ak]AW[ee]C[White must save the N3 and Q6 groups.]FF[4]GM[1]AP[SGFC:1.13b]GN[temp] (;W[ip];B[jo] (;W[jn];B[ho];W[go];B[hn];W[fn];B[gm] (;W[fl];B[gh] (;W[gj];B[gi];W[fm];B[gj] (;W[di];B[hh] (;W[ih];B[hg];W[jg];B[if];W[ie];B[jf];W[kf];B[je];W[jd];B[ke] (;W[le];B[kd]LB[lc:a]LB[md:b]C[Is 'a' or 'b' better shape?] (;W[md];B[lc];W[nc];B[mb];W[nb];B[ma]LB[la:a]C[please play at 'a'];W[la];B[dj];W[na];B[ej] (;W[el];B[dk]LB[bk:a]LB[cl:b]LB[kn:c]LB[nn:d]LB[on:e]C[Choose from 'c', 'd' and 'e' if you think white is already safe on the lower side or pick the better of the moves 'a' and 'b' otherwise.] (;W[bk];B[cl]LB[bm:a]C[please play at 'a'];W[bm];B[al];W[bo];B[ao] (;W[bq];B[aq]LB[cq:a]LB[ds:b]LB[ff:c]LB[kn:d]LB[nn:e]LB[on:f]C[If you think white is safe at the bottom choose from 'd', 'e' and 'f' otherwise play 'a', 'b' or 'c'.] (;W[kn] (;B[ds];W[cq];B[br]LB[fg:a]LB[ff:b]LB[gf:c]LB[nn:d]LB[on:e]LB[ks:f]C[Please choose from a-f.] (;W[ff];B[ks];W[ls]C[The white group at the bottom is safe for now. RIGHT]) (;W[fg];B[ja];W[kb];B[ff];W[gf];B[ia]C[White is caught short of liberties.]) (;W[gf];B[ja];W[kb];B[ff];W[fg];B[ia]C[White is caught short of liberties.]) (;W[nn];B[ff]C[White must protect the double peep.]) (;W[on];B[ff]C[White must protect the double peep.]) (;W[ks];B[ff]C[White must protect the double peep. L1 only allows white to get the black G11 stones when they have no other escape route.])) (;B[ff];W[cq] (;B[fg];W[br];B[gf];W[on]) (;B[ds];W[br]))) (;W[cq];B[kn] (;W[br];B[nn] (;W[rp];B[si]) (;W[si];B[rp]) (;W[sn];B[rl] (;W[so];B[si]) (;W[rp];B[si]) (;W[si];B[rp])) (;W[so];B[si])) (;W[on];B[nn] (;W[br];B[oo] (;W[no];B[si]) (;W[rp];B[si]) (;W[si];B[rp];W[no];B[sq] (;W[so];B[sn]) (;W[sn];B[rl];W[sg];B[sm]) (;W[sg];B[so])) (;W[sn];B[rl] (;W[rp];B[si]) (;W[si];B[rp];W[no];B[sq];W[sg];B[sm]))) (;W[oo];B[rp]) (;W[rp];B[oo] (;W[br];B[si]) (;W[si];B[ds];W[br];B[cs])) (;W[si];B[oo] (;W[rp];B[ds];W[br];B[cs]) (;W[br];B[rp];W[no];B[sq] (;W[so];B[sn]) (;W[sn];B[rl];W[sg];B[sm]) (;W[sg];B[so])) (;W[no];B[ds])) (;W[sn];B[oo] (;W[no];B[ds]) (;W[rp];B[ds]) (;W[si];B[ds]) (;W[sm];B[ds]) (;W[br];B[rp];W[no];B[rl];W[si];B[sq];W[sg];B[sm]))) (;W[rp];B[si] (;W[on];B[nn]) (;W[br];B[nn])) (;W[si];B[rp] (;W[br];B[nn]) (;W[on];B[nn];W[br];B[oo];W[no];B[sq] (;W[so];B[sn]) (;W[sn];B[rl];W[sg];B[sm]) (;W[sg];B[so]))) (;W[sn];B[rl] (;W[so];B[si]) (;W[si];B[rp];W[on];B[nn] (;W[sg];B[oo];W[no];B[ds]) (;W[so];B[sq])) (;W[rp];B[si]))) (;W[ds];B[kn] (;W[on];B[nn] (;W[oo];B[rp]) (;W[rp];B[si]) (;W[si];B[rp] (;W[sn];B[rl] (;W[so];B[sq]) (;W[sg];B[oo];W[no];B[sm]C[ko, black takes first (black has large threats at L1, B2, M2 or L1, C3, C3, M2)];W[sj];B[so]C[ko, black takes first])) (;W[sg];B[oo];W[no];B[sm] (;W[sj];B[rl];W[sn];B[so]C[ko, black takes first]) (;W[sn];B[rl];W[sj];B[so]C[ko, black takes first]) (;W[so];B[sq]))) (;W[sn];B[rl] (;W[oo];B[rp]) (;W[rp];B[si]) (;W[si];B[rp] (;W[so];B[sq]) (;W[sg];B[oo];W[no];B[sm]C[ko, black takes first];W[sj];B[so]C[ko, black takes first])) (;W[so];B[si]))) (;W[rp];B[si]) (;W[si];B[rp] (;W[on];B[nn] (;W[sn];B[rl] (;W[so];B[sq]) (;W[sg];B[oo];W[no];B[sm]C[ko, black takes first];W[sj];B[so]C[ko, black takes first])) (;W[sg];B[oo];W[no];B[sm] (;W[sn];B[rl]C[ko, black takes first];W[sj];B[so]C[ko, black takes first]) (;W[sj];B[rl] (;W[sn]C[ko, black takes first];B[so]C[ko, black takes first]) (;W[so];B[sq])) (;W[so];B[sq]))) (;W[sn];B[on]) (;W[sg];B[on])) (;W[sn];B[rl] (;W[rp];B[si]) (;W[on];B[nn] (;W[oo];B[rp]) (;W[rp];B[si]) (;W[si];B[rp] (;W[so];B[sq]) (;W[sg];B[oo];W[no];B[sm]C[ko, black takes first];W[sj];B[so]C[ko, black takes first])) (;W[so];B[si])) (;W[si];B[rp] (;W[sg];B[on]) (;W[on];B[nn] (;W[sg];B[oo];W[no];B[sm]C[ko, black takes first];W[sj];B[so]C[ko, black takes first]) (;W[so];B[sq]))))) (;W[ff];B[kn] (;W[ds];B[si]) (;W[cq];B[nn] (;W[br];B[si]) (;W[ds];B[si]) (;W[si];B[ds]) (;W[rp];B[ds]) (;W[sn];B[ds])) (;W[on];B[nn] (;W[oo];B[rp]) (;W[rp];B[si]) (;W[si];B[ds]) (;W[sn];B[si];W[sm];B[ds])) (;W[rp];B[ds]) (;W[sn];B[ds]) (;W[si];B[ds])) (;W[nn];B[kn] (;W[on];B[ds];W[cq];B[br] (;W[jm];B[ff]C[black catches some stones and the lower group dies]) (;W[ff];B[jm])) (;W[ds];B[on] (;W[rp];B[si]) (;W[si];B[rp]) (;W[sn];B[rp])) (;W[cq];B[on] (;W[br];B[si]) (;W[ds];B[si]) (;W[rp];B[si]) (;W[sn];B[rp]) (;W[si];B[rp]))) (;W[on];B[ds];W[cq];B[br] (;W[ff];B[kn];W[jm];B[nn];W[oo];B[rp]) (;W[nn];B[ff]C[black catches some stones]) (;W[kn];B[ff]C[black catches some stones and kills the lower group]))) (;W[cq];B[kn] (;W[br];B[si]) (;W[bq];B[nn] (;W[rp];B[si]) (;W[si];B[rp]) (;W[sn];B[rl];W[si];B[rp])) (;W[on];B[nn] (;W[oo];B[rp]) (;W[rp];B[si]) (;W[sn];B[oo] (;W[no];B[ds]) (;W[br];B[rp];W[no];B[rl] (;W[si];B[sq];W[sg];B[sm]) (;W[so];B[si])) (;W[bq];B[rp];W[no];B[rl] (;W[so];B[si]) (;W[si];B[sq];W[sg];B[sm]))) (;W[si];B[oo] (;W[sn];B[ds]) (;W[no];B[ds]) (;W[rp];B[ds]) (;W[br];B[rp];W[no];B[sq] (;W[so];B[sn]) (;W[sg];B[so]) (;W[sn];B[rl];W[sg];B[sm])) (;W[bq];B[rp];W[no];B[sq] (;W[so];B[sn]) (;W[sn];B[rl];W[sg];B[sm]) (;W[sg];B[so])))) (;W[rp];B[si]) (;W[sn];B[nn] (;W[sm];B[ds]) (;W[br];B[rl] (;W[rp];B[si]) (;W[si];B[rp])) (;W[bq];B[rl] (;W[rp];B[si]) (;W[si];B[rp]))) (;W[si];B[nn] (;W[br];B[rp]) (;W[bq];B[rp]) (;W[rp];B[ds]) (;W[sn];B[ds]) (;W[sg];B[ds]))) (;W[ds];B[cq]) (;W[kn];B[cq])) (;W[cl];B[bk];W[bm];B[al];W[bo];B[ao];W[bq];B[aq]LB[ff:a]LB[bi:b]C[Close but white will not have time to protect against both black 'a' and 'b'. Compare with part 3 for how black can do better than ko after 'b' now.]) (;W[kn];B[bq]C[black isn't fooled into playing C3]) (;W[nn];B[bq]C[black doesn't fall into the trap at C3]) (;W[on];B[bq]C[black sees the danger of playing C3])) (;W[cl];B[kn] (;W[el];B[nn] (;W[rp];B[si]) (;W[si];B[rp]) (;W[sn];B[rl] (;W[si];B[rp]) (;W[rp];B[si]))) (;W[rp];B[nn] (;W[el];B[si]) (;W[sn];B[el]) (;W[si];B[el])) (;W[sn];B[nn] (;W[sm];B[el]) (;W[el];B[rl] (;W[rp];B[si]) (;W[si];B[rp])) (;W[si];B[el]) (;W[rp];B[el])) (;W[si];B[nn] (;W[rp];B[el]) (;W[sn];B[el]) (;W[sg];B[el]) (;W[el];B[rp])) (;W[on];B[nn] (;W[oo];B[rp]) (;W[rp];B[oo] (;W[sn];B[el]) (;W[si];B[el]) (;W[el];B[si])) (;W[el];B[oo] (;W[rp];B[si]) (;W[sn];B[rp];W[no];B[rl];W[si];B[sq];W[sg];B[sm]) (;W[si];B[rp];W[no];B[sq] (;W[so];B[sn]) (;W[sn];B[rl];W[sg];B[sm]) (;W[sg];B[so])) (;W[no];B[si])) (;W[sn];B[oo] (;W[rp];B[el]) (;W[sm];B[el]) (;W[si];B[el]) (;W[no];B[el]) (;W[el];B[rp];W[no];B[rl];W[si];B[sq];W[sg];B[sm])) (;W[si];B[oo] (;W[rp];B[el]) (;W[sn];B[el]) (;W[sg];B[el]) (;W[el];B[rp];W[no];B[sq] (;W[so];B[sn]) (;W[sn];B[rl];W[sg];B[sm]) (;W[sg];B[so])))))) (;W[lc];B[md];W[nc];B[mb];W[nb];B[ma]LB[la:a]C[please play at 'a'];W[la];B[dj];W[na];B[ej];W[el];B[dk] (;W[bk];B[cl]LB[bm:a]C[please play at 'a'];W[bm];B[al];W[bo];B[ao];W[bq];B[aq]LB[ne:a]LB[kn:b]C[Close but white will need to protect at both 'a' and 'b'. See part 2 to see why more clearly.]) (;W[cl];B[bk];W[bm];B[al];W[bo];B[ao];W[bq];B[aq]LB[aj:a]LB[ff:b]LB[kn:c]LB[ne:d]C[white has left too many weaknesses behind.]))) (;W[kd];B[le]LB[el:a]LB[on:b]C[black has the squeeze at 'a' or wins the capturing race at 'b'])) (;W[hg];B[ih] (;W[kn];B[el];W[fo];B[ks]) (;W[el];B[on] (;W[kn];B[rp]) (;W[nj];B[nn]C[this only adds another 4 stones to the prisoner pile]) (;W[sn];B[rp]) (;W[si];B[rp]) (;W[rp];B[sn] (;W[kn];B[sq] (;W[rl];B[sm]C[black wins here];W[sl];B[rl];W[si];B[so]) (;W[si];B[so]) (;W[nj];B[nn];W[jm];B[so])) (;W[rl];B[sm] (;W[sl];B[sq];W[si];B[rl];W[sg];B[so]) (;W[rl];B[sq];W[si];B[sl];W[sg];B[so]) (;W[si];B[sq]C[black wins])) (;W[si];B[sq]C[black wins here]) (;W[if];B[kn]C[black wins here]))))) (;W[hh];B[di] (;W[dj];B[el];W[fo];B[ks]) (;W[dh];B[el];W[fo];B[ks]) (;W[ci];B[el];W[fo];B[ks]) (;W[el];B[on] (;W[kn];B[rp]) (;W[si];B[rp]) (;W[sn];B[rp]) (;W[rp];B[sn] (;W[kn];B[sq]C[black wins]) (;W[rl];B[sm] (;W[sl];B[sq];W[si];B[rl];W[sg];B[so]) (;W[rl];B[sq];W[si];B[sl];W[sg];B[so]) (;W[si];B[sq]C[black wins])) (;W[si];B[sq]C[black will win])) (;W[nj];B[nn]C[4 extra prisoners for black])) (;W[kn];B[el];W[fo];B[ks]))) (;W[fm];B[gj] (;W[kn];B[el];W[fo];B[ks]) (;W[el];B[on] (;W[kn];B[rp]) (;W[sn];B[rp]) (;W[si];B[rp]) (;W[nj];B[nn]C[4 extra prisoners for black]) (;W[rp];B[sn] (;W[kn];B[sq]C[black wins]) (;W[rl];B[sm]C[black will win]) (;W[si];B[sq]C[black wins]))))) (;W[fm];B[fl];W[el];B[gh] (;W[gj];B[gi]C[this exchange doesn't help white]) (;W[kn];B[bq] (;W[cl];B[bk];W[dk];B[dj]) (;W[cq];B[ds] (;W[cl];B[bk];W[dk];B[dj]) (;W[bm];B[bk])) (;W[bm];B[bk])) (;W[em];B[bq] (;W[cl];B[bk];W[dk];B[dj]) (;W[bm];B[bk]) (;W[cq];B[ds] (;W[cl];B[bk];W[dk];B[dj]) (;W[bm];B[bk]))) (;W[bq];B[on]C[black wins the capturing race and kills the right side unconditionally, he could also have fought the ko at E7.]) (;W[cl];B[on]C[black wins the capturing race against the Q6 stones]) (;W[cq];B[on]C[black wins the capturing race aginst the Q6 stones]) (;W[ds];B[on]C[black wins the capturing race against the Q6 stones]))) (;W[ho];B[il]) (;W[gm];B[kn] (;W[on];B[nn] (;W[oo];B[rp]) (;W[rp];B[oo] (;W[ho];B[si]) (;W[go];B[si]) (;W[sn];B[ho]) (;W[si];B[ho])) (;W[sn];B[oo] (;W[ho];B[rp];W[no];B[rl];W[si];B[sq];W[sg];B[sm]) (;W[go];B[rp];W[no];B[rl];W[si];B[sq];W[sg];B[sm])) (;W[si];B[oo] (;W[ho];B[rp];W[no];B[sq] (;W[so];B[sn]) (;W[sn];B[rl];W[sg];B[sm]) (;W[sg];B[so])) (;W[go];B[rp];W[no];B[sq] (;W[so];B[sn]) (;W[sn];B[rl];W[sg];B[sm]) (;W[sg];B[so])) (;W[sn];B[ho]) (;W[rp];B[ho]) (;W[sg];B[ho])) (;W[go];B[si] (;W[sn];B[rl] (;W[oo];B[rp]) (;W[rp];B[oo])) (;W[oo];B[rp]) (;W[rp];B[oo])) (;W[ho];B[oo] (;W[rp];B[si]) (;W[no];B[si]) (;W[sn];B[rp];W[no];B[rl];W[si];B[sq];W[sg];B[sm]) (;W[si];B[rp];W[no];B[sq] (;W[so];B[sn]) (;W[sn];B[rl];W[sg];B[sm]) (;W[sg];B[so])))) (;W[nn];B[on]LB[ho:a]LB[rp:b]C[white can't defend 'a' and 'b']) (;W[rp];B[nn] (;W[ho];B[si]) (;W[go];B[si]) (;W[si];B[ho])) (;W[sn];B[nn] (;W[ho];B[rl] (;W[rp];B[si]) (;W[si];B[rp])) (;W[go];B[rl] (;W[rp];B[si]) (;W[si];B[rp])) (;W[sm];B[ho])) (;W[si];B[nn] (;W[rp];B[ho]) (;W[sn];B[ho]) (;W[ho];B[rp]) (;W[go];B[rp])) (;W[ho];B[nn] (;W[rp];B[si]) (;W[si];B[rp]) (;W[sn];B[rl] (;W[rp];B[si]) (;W[si];B[rp]))) (;W[go];B[si] (;W[sn];B[rl] (;W[on];B[nn];W[oo];B[rp]) (;W[rp];B[nn])) (;W[rp];B[nn]) (;W[on];B[nn] (;W[sn];B[rl] (;W[oo];B[rp]) (;W[rp];B[oo])) (;W[oo];B[rp]) (;W[rp];B[oo]))))) (;W[jo];B[ip] (;W[ho];B[il]) (;W[jn];B[ho])) (;W[ho];B[il]) (;W[jn];B[ip] (;W[jo];B[ho]) (;W[ho];B[go]) (;W[gm];B[ho])) (;W[gm];B[ip]) (;W[on];B[il]) (;W[nn];B[il]))