(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.50]
AW[qa][ib][jb][mb][rb][hc][qc][cd][jd][nd][od][ke][qe][re][df][ff][pf][bg][cg][dg][gg][hg][kg][lg][ng][ah][hi][ki][ri][si][bj][cj][jj][nj][oj][pj][qj][dk][jk][ok][dl][jl][rl][sl][hm][jm][sm][bn][cn][en][jn][on][rn][sn][qo][ro][so][ap][hp][kp][lp][mp][op][qp][eq][rq][ar][ir][mr][or][ms]AB[ra][hb][lb][fc][lc][bd][ld][ce][de][fe][le][me][oe][pe][bf][mf][of][og][dh][oh][ph][qh][rh][sh][di][mi][ni][oi][pi][aj][fj][lj][ak][ek][lk][rk][sk][al][el][il][pl][ql][am][bm][em][qm][rm][dn][fn][mn][co][fo][ko][oo][bp][cp][ep][pp][sp][fq][pq][qq][sq][cr][nr][pr][bs][ns][os][ps]KK[^Bestiary^Hatsuyoron^Puzzles^Seki]
(;B[po]C[It is not clear that this is the starting point. Here is an example of what happens if Black begins elsewhere]
(;W[rr]
;B[qk]
;W[ml]
;B[ll]C[The black group dies if it is cut]
;W[mm]
;B[lm]
;W[nn]
;B[no]
;W[mo]
;B[ln]C[Looks like it will end in semeai, but...]
;W[pn]
;B[qn]
;W[rp]
(;B[ol]
;W[nl]
;B[nm]
;W[om]
(;B[mj]C[A very subtle move (another godlike move, actually) :  it will make a difference in a hundred moves, if Black choose to sacrifice this group in the end, because in that case, she will have loss one stone less... ]
;W[nk]
(;B[np]
;W[rs]
(;B[sr]
;W[oq]
;B[mq]
(;W[lr]C[Of course, White cannot block :]
;B[lq]C[Idem. At this stage, losing the fight end the game, as all the groups involved are too big. But how can Black get out?]
;W[kr]
;B[kq]
(;W[jp]
;B[jq]
(;W[jr]
;B[iq]
;W[hq]
;B[gr]
(;W[hr]C[Strange connection, but...]
;B[ip]
(;W[jo]
;B[io]
;W[ho]
;B[in]
(;W[hn]C[Same  problem, or else : ]
;B[im]
;W[hl]
;B[ik]
;W[hk]
;B[ij]
(;W[hj]C[Idem :]
;B[ii]
;W[ih]
;B[ji]
;W[kj]
;B[jh]
;W[kh]
;B[jg]
(;W[jf]C[White must keep this group down to  two liberties :]
;B[ig]
;W[hh]
;B[if]
;W[ie]
;B[hf]
;W[he]
;B[gf]
;W[ge]
;B[fg]
;W[ef]
;B[fh]
(;W[rg]C[Is this the best solution? All those variations will be reanalysed after the German group get  a definitive conclusion]
;B[ks]C[This is a transmission semeai : groups outside of the seki fight at distance]
;W[mc]
;B[pd]
;W[pc]
;B[la]
;W[mg]
;B[hs]
;W[ne]
;B[nf]
;W[kb]
(;B[gq]C[Moreover, the details of this semeai are dreadfully complex. Why should  Black not push at  N1 ?]
;W[qg]
;B[gp]
;W[pg]
;B[go]
;W[sg]
;B[gn]C[Now, it is a straight race]
;W[ma]
;B[gm]
;W[ka]
;B[gl]
;W[kc]
;B[gk]
;W[md]
;B[gj]
;W[kd]
;B[gi]
(;W[nq]C[Seems better]
;B[mq]
(;W[oq]
;B[qr]
;W[nq]
;B[qs]
;W[lq])
(;W[lf]
;B[qr]
;W[nh]
;B[qs]
;W[ss]
;B[sq]
;W[li]
;B[sp]
;W[mh]
;B[sr]
;W[kk]
;B[pm]
;W[nm]
;B[rj]
;W[qi]
;B[sj]
;W[kl]
;B[pk]
;W[gb]
;B[fb]
;W[fa]
;B[ea]
;W[ga]
;B[gc]
;W[ha]
;B[ec]
;W[ee]
;B[fd]
;W[dd]
;B[cc]
;W[ed]
;B[dc]
;W[cm]
;B[dm]
;W[bo]
;B[bq]
;W[aq]
;B[is]
;W[js]
;B[gs]
;W[af]
;B[ae]
;W[cf]
;B[ag]
;W[be]
;B[ce]
;W[de]
;B[be]
;W[af]
;B[bc]
;W[qd]
;B[km]
;W[kn]
;B[mk]
;W[lo]
;B[lq]
;W[kq]
;B[nq]
;W[gd]
;B[dj]
;W[ck]
;B[bi]
;W[ai]
;B[bh]
;W[ag]
;B[eg]
;W[br]
;B[ch]
;W[gf]
;B[bl]
;W[cl]
;B[ci]
;W[bk]
;B[cs]
;W[an]
;B[as]
;W[ao]C[Even with an exceptionnal White yose, Black is a dozen points ahead...]))
(;W[lf]
;B[nq]C[This line of play  was included as main variation by  T .Mark Hall, but I find this hard to believe]
;W[oq]
;B[gh]
;W[qd]
;B[is]
;W[nh]
;B[js]
;W[mh]
;B[qr]
;W[li]
;B[qs]
;W[ss]
;B[sq]
(;W[kk]C[The seki layers are crumbling....]
;B[sp]
;W[kl]
;B[sr]
;W[km]
;B[pm]
;W[nm]
;B[rj]
;W[qi]C[Hard to see what waswrong with this exchange played earlier..]
;B[sj]
;W[kn]
;B[pk]C[White loses the fight by one liberty, but even if he won it...]
;W[lo]
;B[gb]
;W[mk]
(;B[fd]
;W[cm]
;B[an]
;W[bo]
;B[ao]
;W[aq]
;B[bi]
;W[ai]
;B[bh]
;W[ag]
;B[bk]
;W[ck]
;B[bl]
;W[cl]
;B[ak]
;W[aj]
;B[bl]
;W[ao]
;B[am]C[There is no semai in this variation...])
(;B[cm]C[Even if White save that group]
;W[ee]
;B[ed]
;W[fd]
;B[ec]
;W[dm]
;B[do]
;W[bi]
;B[dj]
;W[ck]
;B[ch]
;W[bh]
;B[an]
;W[gc]
;B[fb]
;W[ha]
;B[ga]
;W[ia]
;B[af]
;W[cf]
;B[dd]
;W[eg]
;B[eh]C[Black is 40 points ahead]))
(;W[kl]
;AW[mk]C[Here, the sacrifice at move 20]
;B[sp]
(;W[kk]
;B[pm]
;W[nm]
;B[rj]
;W[qi]
;B[sr]
;W[km]
;B[sj]C[Would not change anything])
(;W[rj]
;B[pm]
;W[nm]
;B[sr]
;W[kk]
;B[sj]
;W[km]
;B[pk]))))
(;B[ma]
(;W[ob]C[No liberties lost in this variation])
(;W[na]
;B[nb]
;W[oa]
;B[nc]
;W[oc]
;B[md]
;W[ob]C[And that way ?])))
(;W[hs]C[The Japanese solution, probably not the best]
(;B[ee]
;W[cm]
;B[an]C[Black attack seems over, nevertheless...]
;W[bo]
;B[ao]
;W[aq]
(;B[bi]
;W[ai]
;B[bh]
;W[ag]
;B[bk]
;W[ck]
;B[bl]C[An incredible move. Even if this is not the main variation, it must be seen...]
;W[cl]
;B[ak]
;W[aj]
;B[bl]
;W[ao]
;B[am]
;W[bk]
;B[al]C[White is dead, but has many liberties ; a new transmission semeai starts ]
;W[rg]
;B[pd]
;W[pc]
;B[mc]C[Some subtle differences between the two variations ; why?]
;W[nb]
;B[la]
;W[qg]
;B[dj]
;W[nc]
;B[eg]
;W[mg]
;B[cf]
;W[ne]
;B[nf]
;W[kb]
;B[af]
;W[ka]
;B[dm]
;W[kc]
;B[ch]
;W[kd]
;B[ci]
;W[pg]
;B[br]
;W[ma]
;B[bq]
;W[qd]
;B[as]
;W[sg]
;B[bm]
;W[an]
;B[al]
;W[md]
;B[ak]
;W[lf]
;B[bl]
;W[nh]
;B[am]
;W[bm]
;B[al]
(;W[mh]
;B[nq]
;W[oq]
;B[ak]
;W[li]
;B[bl]
;W[am]
;B[al]
;W[kk]
;B[ak]
;W[kl]
;B[qr]
;W[km]
;B[qs]
;W[ss]
;B[sq]
;W[mk]
;B[pm]
;W[nm]
;B[sp]
;W[lo]
;B[sr]
;W[qi]
;B[gb]
;W[ia]
;B[gd]
;W[hd]
;B[gc]
;W[fr]
;B[er]
;W[fs]
;B[es]
;W[gs]
;B[gq]
;W[gp]
;B[fp]
;W[gi]
;B[fi]
;W[gl]
;B[ha]C[Black wins easily (+15)])
(;W[nq]
;B[mq]
;W[mh]
;B[qr]
;W[li]
;B[qs]
;W[ss]
;B[sq]
;W[kk]
;B[sp]
;W[kl]
;B[sr]
;W[km]
;B[pm]
;W[nm]
;B[rj]
;W[qi]
;B[sj]
;W[kn]
;B[pk]C[Agan, only one liberty ahead]
;W[gb]
;B[fb]
;W[fa]
;B[ea]
;W[ga]
;B[gc]
;W[ha]
;B[eb]
;W[fr]
;B[er]
;W[fs]
;B[es]
;W[gs]
;B[gd]
;W[gq]
;B[fp]
;W[gi]
;B[fi]
;W[lq]
;B[hd]
;W[id]
;B[nq]
;W[gl]
;B[mk]
;W[lo]C[This variation (where White could not decline the 20 stones offer) was said by Shuko's group to be the best one, with a 2 or 3 points win for Black. But I am no longer sure of anything ; we will have to wait for more confirmation of the German analysis])
(;W[rj]C[Another example of those hard to understand minor variations]
;B[qi]
;W[pk]
;B[mk]
;W[gb]
;B[fb]
;W[fa]
;B[ea]
;W[ga]
;B[gc]
;W[ha]
;B[eb]
;W[fr]C[Tesuji for yose]
;B[er]
;W[fs]
;B[es]
;W[gs]
;B[gd]
;W[gq]
;B[fp]
;W[gj]
;B[fi]
;W[hd]
;B[nq]
;W[oq]
;B[ak]
;W[mh]
;B[bl]
;W[am]
;B[al]
;W[li]
;B[bl]
;W[kk]
;B[ak]
;W[kl]
;B[qr]
;W[km]
;B[qs]
;W[ss]
;B[sq]
;W[kn]
;B[sp]
;W[lo]
;B[sr]
;W[gl]
;B[fl]
;W[gm]
;B[fm]
;W[gn]
;B[fk]C[The count  : White  67+60 (+1?), Black  82+45 ; Is white winning here ? (actually, this is my personal rediscovery of one of the German variations)]))
(;B[bq]
;W[ai]
;B[as]
;W[bk]
;B[br]
;W[bl]
;B[ap]
;W[ch]C[White lives...]))
(;B[cm]C[To refute this move took me some time, and I may be wrong ; this is a good example of some of the hidden marvels yet to be discussed]
;W[ee]
;B[fd]
;W[ed]
;B[ec]
(;W[dd]C[Seems the best]
;B[cb]
;W[db]
;B[dc]
(;W[cc]
;B[bb]
;W[bc]
;B[ac]
;W[cf]
;B[be]
;W[ad]
;B[ae]
;W[ab]
;B[aa]
;W[eb]
;B[fb]
;W[ag]
;B[ab]
;W[af]
;B[ad]
;W[ca])
(;W[bb]
;B[cc]
;W[bc]
;B[ba]
;W[be]
;B[ae]
;W[cf]
;B[be]
;W[ac]
;B[ab]
;W[aa]
;B[ca]
;W[af]
;B[ag]
;W[dm]
;B[eo]
;W[af]
;B[kf]
(;W[lf]C[White must answer]
;B[ag]
;W[rj]
;B[qi]
;W[af]
;B[mg]
;W[ad]
;B[qf]
;W[gb]
;B[bi]
;W[ci]
;B[ch]
;W[bh]
;B[ai]
;W[eh]
;B[ei]
;W[eg]
;B[nb]
;W[ob]
;B[mc]
;W[nc]
;B[ma]C[The seki is still here, but thois is a global disaster for Black, (White> 60, Black <55)])
(;W[ad]
;B[je]
;W[lf]
;B[kd])))
(;W[dc]C[Works perhaps also]
;B[dd]
;W[cc]
;B[bc]
;W[bb]
(;B[ca]C[First tesuji, but]
;W[eb]
(;B[da]C[This splendid tesuji]
(;W[db]C[doesn't work in this case]
;B[fb]
;W[ea]
;B[fa]
;W[cb]
(;B[ab]
;W[ba]
(;B[ac]
;W[ae]
(;B[be]
;W[af])
(;B[af]
;W[be]
;B[ad]
;W[be]
;B[cf]
;W[ag]
;B[ae]
;W[aa]))
(;B[be]
;W[gb]
;B[ac]
;W[gc]))
(;B[ba]
;W[aa]
(;B[ca]
;W[gb]
;B[ac]
;W[gc]
;B[ab]
;W[ga])
(;B[ac]
;W[gb])))
(;W[fb]
;B[db]
;W[cb]
;B[ab]))
(;B[fb]
(;W[cb]
(;B[ea]
;W[be]
;B[ae]
;W[cf]
;B[be]
;W[ac]
(;B[ba]
;W[ab]
;B[db]
;W[ag])
(;B[ab]
;W[aa]
;B[db]
;W[ag]))
(;B[ab]
;W[da]
(;B[fa]
;W[be]
;B[ae]
;W[cf]
;B[be]
;W[ac]
;B[ad]
;W[ba]
;B[ea]
;W[db])
(;B[ba]
;W[aa]
;B[ba]
;W[be]
;B[ae]
;W[cf]
;B[be]
;W[ac]))
(;B[da]
;W[be]
;B[ae]
;W[cf]
;B[be]
;W[ac]
;B[db]
;W[ab]
;B[ba]
;W[ag]))
(;W[db]
;B[ea]
;W[cb]
;B[da]
;W[ba]
;B[fa]
;W[be]
;B[ae]
;W[cf]
;B[be])))
(;B[ab]
;W[eb]
;B[fb]
;W[cb]
;B[ea]
;W[be]
;B[ae]
;W[cf]
;B[be]
;W[ac]
;B[ba]
;W[ca]
;B[ad]
;W[aa]
;B[kf]
;W[lf]
;B[ba]
;W[af]
;B[ag]
;W[aa]
;B[db]
;W[af]
;B[gd]
;W[hd]
;B[ag]
;W[ac]C[Here, Black loses everything]))))
(;W[nq]
;B[mq]
;W[oq]
;B[qr]
;W[nq]
;B[qs]
;W[ss]
;B[sq]
;W[lq]
;B[sp]
;W[dm]
;B[eo]
;W[cm]
;B[an]
;W[bo]
;B[ao]
;W[gb]
;B[fb]
;W[mc]C[Simplest variation  : still an easy Black win (White : 80, Black : 95)]))
(;W[ig]
;B[jf]
;W[kf]
;B[ie]
;W[ge]
;B[id]
;W[jc]
;B[je]
;W[kd]
;B[nq]
;W[oq]
;B[qr]
;W[if]
;B[qs]
;W[ss]
;B[sq]C[Black wins easily this fight]))
(;W[ii]
;B[hj]
;W[gj]
;B[gk]
;W[gi]
;B[hs]
;W[nq]
;B[mq]
;W[oq]
;B[qr]
;W[nq]
;B[qs]
;W[ss]
;B[sq]
;W[lq]
;B[sp]C[Better, but still a clear loss for White (White: 75, Black: 90)]))
(;W[im]
;B[hn]
;W[gn]
;B[gm]
;W[go]
;B[hs]
;W[nq]
;B[mq]
;W[oq]
;B[qr]
;W[nq]
;B[qs]
;W[ss]
;B[sq]
;W[lq]
;B[sp]C[Still not enough for White]))
(;W[io]
;B[nq]
;W[oq]
;B[jo]))
(;W[ip]C[Why does White connect ?]
(;B[hr]C[If he doesn't, Black cuts !! Here, for the first time, we meet the  hanezeki]
;W[nq]C[Sooner or later, White must capture ]
;B[mq]
;W[oq]C[Black has won a liberty : ]
;B[qr]
;W[nq]
;B[qs]
;W[ss]
;B[sq]
;W[lq]
;B[sp]C[Black wins easily the game])
(;B[nq]C[If Black threatens to live first...]
;W[oq]
;B[hr]
;W[qr]
;B[is]
;W[op]
;B[js]
;W[ss]
;B[ks]C[She succeeds, but...]
;W[sq]C[After White lives, Black has lost her main group again])))
(;W[iq]
;B[jr]
;W[js]
;B[nq]
;W[oq]
;B[ks]))
(;W[jq]
;B[nq]
;W[oq]
;B[jp]))
(;W[lq]
;B[nq]
;W[oq]
;B[lr]))
(;B[oq]
;W[sr]C[The seki above is temporary, as the outside black group is dead ; therefore, Black must continue the race outside]))
(;B[rj]C[Perhaps better to play here ; this comes from the Choinese commentary ]
;W[qi]
;B[np]C[The only following line given in my   references is not commented]
;W[rs]
;B[sr]
;W[oq]
;B[mq]
;W[lr]
;B[lq]
;W[kr]
;B[kq]
;W[jp]
;B[jq]
;W[jr]
;B[iq]
;W[hq]
;B[gr]
;W[hr]
;B[ip]
;W[jo]
;B[io]
;W[ho]
;B[in]
;W[hn]
;B[im]
;W[hl]
;B[ik]
;W[hk]
;B[ij]
;W[hj]
;B[ii]
;W[ih]
;B[ji]
;W[kj]
;B[jh]
;W[kh]
;B[jg]
;W[jf]
;B[ig]
;W[hh]
;B[if]
;W[ie]
;B[hf]
;W[he]
;B[gf]
;W[ge]
;B[fg]
;W[ef]
;B[fh]
;W[hs]
;B[ee]
;W[cm]
;B[an]
;W[bo]
;B[ao]
;W[aq]
;B[bi]
;W[ai]
;B[bh]
;W[ag]
;B[bk]
;W[ck]
;B[bl]
;W[cl]
;B[ak]
;W[aj]
;B[bl]
;W[ao]
;B[am]
;W[bk]
;B[al]
;W[rg]
;B[pd]
;W[pc]
;B[mc]
;W[nb]
;B[la]
;W[qg]
;B[dj]
;W[nc]
;B[eg]
;W[mg]
;B[cf]
;W[ne]
;B[nf]
;W[kb]
;B[af]
;W[ka]
;B[dm]
;W[kc]
;B[ch]
;W[kd]
;B[ci]
;W[pg]
;B[br]
;W[ma]
;B[bq]
;W[qd]
;B[as]
;W[sg]
;B[bm]
;W[an]
;B[al]
;W[md]
;B[ak]
;W[lf]
;B[bl]
;W[nh]
;B[am]
;W[bm]
;B[al]
;W[pk]
;B[mk]
;W[gb]
;B[fb]
;W[fa]
;B[ea]
;W[ga]
;B[gc]
;W[ha]
;B[eb]
;W[fr]
;B[er]
;W[fs]
;B[es]
;W[gs]
;B[gd]
;W[gq]
;B[fp]
;W[gj]
;B[fi]
;W[hd]
;B[nq]
;W[oq]
;B[ak]))
(;B[nk]
;W[mk]
;B[mj]
;W[nk]
;B[qi]
;W[rj]C[Always the same seki ; the difference, if any, will appear in more than 100 moves...]))
(;B[nm]
;W[om]
(;B[ol]C[Same result])
(;B[nl]
;W[ol]
;B[mk]
;W[rj]
;B[nk]
;W[pk]
;B[mj]
;W[sj]
;B[np]
;W[oq]
;B[nq]
;W[oq]C[Black can no longer win the game])))
(;W[sr]
;B[qn]
;W[rp]
;B[rr]
;W[sq]
;B[qk]))
(;B[ml]
;W[po]
;B[no]
;W[nn]
;B[np]
;W[mo]
;B[nq]
;W[pn]
;B[ol]
;W[qk]C[Black position crumbles]))