(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
AW[aa][ba][ca][la][ma][na][oa][pa][qa][ra][sa][ab][bb][fb][hb][jb][kb][mb][nb][qb][rb][sb][ac][bc][dc][mc][pc][sc][cd][ed][fd][gd][id][ld][nd][pd][qd][de][ie][ke][ne][bf][df][ef][if][lf][nf][of][qf][rf][sf][ag][gg][ig][kg][mg][pg][ah][bh][dh][eh][hh][kh][ph][ai][bi][ci][fi][gi][hi][ii][ji][mi][oi][ri][si][aj][bj][ej][hj][kj][rj][sj][ak][bk][gk][ik][pk][rk][sk][cl][dl][gl][il][kl][nl][pl][ql][am][bm][hm][jm][lm][sm][cn][nn][on][rn][ao][eo][go][io][ko][oo][ro][fp][hp][kp][pp][qp][cq][dq][gq][iq][jq][lq][mq][pq][sq][ar][br][gr][ir][jr][pr][rr][sr][es][gs][js][ks][ls][ns][os][rs][ss]AB[ha][ia][ja][ka][db][lb][ob][pb][kc][lc][nc][oc][qc][ad][hd][md][od][sd][ae][he][me][oe][pe][re][af][hf][bg][fg][ch][fh][gh][jh][oh][sh][ei][ki][pi][qi][cj][fj][gj][ij][jj][mj][oj][qj][ck][hk][ok][qk][bl][fl][nm][en][fn][mn][qn][do][fo][mo][po][bp][cp][dp][ip][jp][lp][np][op][sp][eq][hq][kq][rq][hr][mr][nr][or][bs][is][ps]KK[^Genran^Puzzles]
;W[rc]
;B[rd]
;W[qe]
;B[qc]
;W[qb]C[Same start as in Dosetsu's problem, with a slightly different shape (and one more stone sacrificed)]
;B[ib]
;W[jc]
;B[ic]
;W[jd]C[obviously forced up to this point]
;B[gb]
(;W[hc]C[first surprise]
;B[gc]
;W[hc]
;B[hg]
(;W[gf]
;B[ih]
;W[hi]
;B[hh]C[no change in this part of the problem]
;W[hj]
;B[di]
(;W[dj]
;B[al]
;W[bi]
(;B[ci]
;W[bk]
;B[bj]
;W[aj]
;B[li]
(;W[lj]
;B[mh]
;W[ni]
;B[nh]
;W[lh]
;B[nj]
;W[pj]C[False eyes]
;B[ol]
(;W[om]
;B[mm]
(;W[ml]
;B[pm]
;W[qm]
;B[rl]
;W[rm]
;B[rh]
(;W[qh]C[hard to believe, yet...]
;B[sl]
;W[rk]
(;B[no]
;W[pn]
;B[pm]
;W[on]
;B[pn]
;W[om]
;B[lr]
;W[kr]
;B[ms]
;W[os]C[This  mend the eventual mistake in the previous  problem (problem 13)]
;B[kq]
;W[kr]
;B[jq]
;W[jr]
;B[nq]
;W[jo]
;B[mp]
;W[lq]
;B[mq]
;W[ir]
;B[qr]
;W[qq]
;B[qs]
;W[rr]
;B[ns]
(;W[sr]
;B[fk]
;W[el]
;B[gm]
;W[hl]
;B[dn]
;W[ep]
(;B[bq]
(;W[bo]
;B[dr]
;W[cr]
;B[er]
(;W[ds]
;B[cs]
;W[fs]
;B[aq]
;W[as]
;B[cs]
;W[bs]
;B[cs]
;W[cr]C[still no eye]
;B[ai]
;W[ah]
;B[bh]
;W[ai]
;B[ag]
;W[ak]
;B[cf]
;W[be]
;B[bd]
;W[ce]
;B[da]C[last trap]
(;W[eb]
;B[cc]
;W[cb]
;B[cc]
;W[bc]C[Kills everything ]
;B[cb]
;W[bb]C[Black has no cards left to play])
(;W[cc]C[falling in the trap]BM[1]
;B[fc]
;W[eb]
;B[ec]
;W[cb]
;B[ff]C[Last hard sequence. It is hard to beleieve anyone could read all that without any mistake]
;W[ge]
;B[fe]
(;W[cg]
;B[ee]
;W[dd]
;B[eg]
;W[dg]
;B[cf])
(;W[ee]
;B[dg]
;W[eg]
;B[dd])
(;W[ea]
;B[ee]
;W[dd]
;B[dg]
;W[eg]
;B[cg])))
(;W[fq]BM[1]
;B[iq]
;W[hs]
;B[lq]
;W[js]
;B[ks]
;W[is]C[ko, but again white cannot play it]
;B[ds]
;W[fr]
;B[fs]C[Ko]
;W[gp]
;B[cs]
;W[es]
;B[ek]
;W[dk]
;B[fs]
;W[gn]
;B[fm]
;W[es]
;B[mi]
;W[oi]
;B[fs]
;W[gi]
;B[fi]
;W[es]
;B[ii]
;W[hk]
;B[fs]
;W[ap]C[White has never enough threats]
;B[aq]
;W[es]
;B[as]))
(;W[dr]
;B[bo]C[White is dead]))
(;B[bo]
;W[ap]
;B[bq]
;W[aq]))
(;W[rs]C[mistake, a ko appears]BM[1]
;B[os]
;W[rp]
;B[sr]
;W[sq]
;B[mi]
;W[oi]
;B[rq]
;W[qo]
;B[oo]
;W[sq]
;B[nn]
;W[om]
;B[rq]C[another ko which is impossible to win for  White]
;W[so]
;B[ss]
;W[rr]
;B[rs]
;W[sq]
;B[rj]
;W[sk]
;B[sp]))
(;B[rj]
;W[sj]C[doesn't change anything])
(;B[sj]
;W[rj]))
(;W[sl]C[It is hard to find what is wrong with that move]
;B[rc]
;W[rb]
;B[pf]
(;W[qh]
;B[og]
;W[oi]
;B[mf])
(;W[og]
;B[qg]
;W[ng]
;B[qh]
(;W[se]
;B[mf]
;W[lg]
;B[jf])
(;W[mf]
;B[oi]
;W[mi]
;B[rg]
;W[sb]
;B[sg]))))
(;W[pm]
;B[ml]
;W[mk]
;B[lk]))
(;W[ml]
;B[pm]
;W[rl]
;B[om]))
(;W[ni]
;B[kk]
;W[jk]
;B[lj]
;W[lk]
;B[ii]
;W[kj]
;B[gi]
;W[hj]
;B[kk]C[White has no threats])
(;W[kk]
;B[mh]
;W[ni]
;B[nh]
;W[lj]
;B[nj]C[vivant]
(;W[pj]
;B[lh])
(;W[lh]
;B[pj])))
(;B[bj]
(;W[aj]
(;B[ci]
;W[bk]
;B[li]C[Back to main variation])
(;B[bk]
;W[ci]
;B[fi]
;W[dk]
;B[li]C[voir la variante principale ;à l'exception de la séquence finale, que nor ne peut plus menacer]))
(;W[ci]
;B[fi]
;W[aj]
;B[bh]C[échec, noir vit])))
(;W[al]
;B[ek])
(;W[ek]
;B[al]
;W[bi]
;B[bk]
;W[ci]
;B[bh]
;W[dj]
;B[fi]
;W[ai]
;B[aj]
;W[dk]
;B[ah]))
(;W[ih]
;B[ff]))
(;W[gc]
;B[hc]C[alive]))
