(;
GM[1]FF[4]VW[]AP[Many Faces of Go:12.21]
SZ[19]
HA[0]
ST[0]
PC["The Most Difficult Problem Ever"]
KM[0.0]
RU[Japanese]
SO[Created by Inoue Dosetsu Inseki (1646 - 1719)]
US[Compiled by Thomas Redecker]
EV[Igo Hatsuyoron]
CP[2011 Thomas Redecker]
RO[Problem 120]
AB[ra][pe][oe][le][lc][lb][ld][me][hb][fc][fe][de][ce][bf][bd]
[of][og][oh][oi][ph][qh][rh][sh][pi][ni][mi][lj][lk][rk][sk]
[ql][pl][qm][rm][sp][sq][qq][oo][pp][pq][pr][ps][os][ns][nr]
[ko][mn][aj][ak][al][am][bm][bs][cr][bp][cp][co][dn][ep][fq]
[fo][fn][em][el][ek][fj][dh][di][il][mf]
AW[qa][rb][qc][qe][re][od][nd][mb][jb][ib][hc][cd][jd][ke][kg]
[lg][ng][pf][nj][oj][pj][ok][qj][ri][si][rl][sl][sm][rn][ro]
[so][sn][rq][qp][qo][on][op][or][mr][ms][ah][bg][cg][dg][df]
[ff][gg][hg][hi][ki][jj][jn][jm][jl][jk][hm][hp][ir][kp][lp]
[mp][bn][cn][ap][ar][en][eq][bj][cj][dk][dl];B[po];W[rr];B[qk];W[ml];B[ll];W[mm];B[lm];W[nn]
;B[no];W[mo];B[ln];W[pn];B[qn];W[rp];B[ol];W[nl];B[nm];W[om]
;B[nk];W[mk];B[mj];W[nk]TR[pk][mk]
;B[rj];W[qi];B[np];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[rg]
C[(0002)
A = ++  (12)
B = +?  (8)
C = +?  (8)
D = +?  (7)
E = +?  (9)
F = +?  (7)
G = +?  (9)
H = +?  (9)
J = +?
K = +?  (7)
L = +?  (7)
M = +?  (2)
N = ++
P = ++
Q = ++
R = ++]
LB[gb:A][fb:B][eb:C][ed:D][fd:E][ee:F][gf:G][ge:H][gd:J][ef:K][cm:L][rf:M][dm:N][eg:P][fg:Q][fh:R]

(;W[eb]C[(0876)
]LB[ec:A][fb:B][gb:C][ee:D][gf:E][qf:F][ef:G]C[A = +?  (8)
B = -?  (-7)
C = -
D = --  (-2)
E = -
F = -?  (-1)
G = +?  (4)
]
(;B[ee]C[(1038)
]LB[rf:A][fb:B][cm:C][gf:D][fg:E]C[A = +?
B = +?  (5)
C = +?  (7)
D = -  (-2)
E = -  (-2)
Does this move winn the tempo Black lost on the right ???]
(;W[rf]C[(1039)
];B[gf];W[ge];B[fg];W[ef];B[fh]LB[hs:A][cm:B][fb:C]C[A = +
B = ++
C = +?
Black must pay attention on the Seki of Yamada Sensei.]
(;W[hs]C[(1040)
]LB[gb:A][fb:B][cm:C]C[A = -?
B = +?  (6)
C = +
]
(;B[fb]C[(1042)
];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]C[(1043)
];W[aj];B[bl];W[ao];B[am];W[bk];B[al];W[mg];B[pd];W[pc];B[nb];W[mc];B[ma];W[ob];B[dm];W[nc];B[na];W[oa];B[la];W[qd];B[dj];W[kb];B[eg];W[ka];B[af];W[kc];B[cf];W[lf];B[ch];W[kn];B[ci];W[lo];B[br];W[li];B[bq];W[mh];B[as];W[sf];B[bm];W[an];B[al]C[(1044)
];W[ne];B[nf];W[kd];B[bl];W[nh];B[ak];W[kk];B[am];W[bm];B[al]C[(1045)
]LB[nq:A][kl:B]C[A = +?  (7)
B = +?  (6)
Black's group in the top right has 6 + 1 liberties.]
(;W[nq]C[(1046)
];B[mq]C[(1047)
];W[oq]C[(1048)
];B[qr];W[nq];B[qs];W[ss];B[sq]C[(1049)
];W[lq];B[sp];W[gb];B[gc];W[ha];B[fa];W[gd];B[fd];W[fr];B[er];W[fs];B[es];W[gs];B[gq];W[gj];B[fi];W[ga];B[pm];W[nm];B[sr];W[qf];B[pk];W[qg];B[sj]C[B + 8(7)])
)))))))))
