(;
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[fd]C[(1675)
]LB[ed:A][ee:B][qf:C]C[A = -?
B = +?  (9)
C = ??
]
(;B[ee]C[(1695)
]LB[rf:A][gd:B][ge:C][cm:D][dm:E]C[A = +?
B = ++  (9)
C = +?  (10)
D = +?  (10)
E = +?  (9)
]
(;W[gd]C[(1697)
]LB[gf:A][ed:B][rf:C]C[A = ++  (7)
B = +  (9)
C = ??
]
(;B[gf]C[(1698)
];W[ge];B[fg];W[ef];B[fh];W[hs]LB[ec:A][cm:B]C[A = +  (7)
B = +  (7)
]
(;B[ec]C[(1699)
];W[cm];B[an];W[bo];B[ao];W[aq]LB[qf:A][bi:B]C[A = +  (1)
B = +?  (7)
]
(;B[bi]C[(1702)
];W[ai];B[bh];W[ag];B[bk];W[ck];B[bl];W[cl];B[ak]C[(1703)
];W[aj];B[bl];W[ao];B[am];W[bk];B[al];W[rf];B[pd];W[pc];B[mc];W[nb];B[gb];W[mg];B[la];W[qd];B[af];W[nc];B[cf];W[ne];B[nf];W[kb];B[dm];W[ma];B[eg];W[ka];B[dj];W[kc];B[ch];W[lf];B[ci];W[kn];B[br];W[lo];B[bq];W[li];B[as];W[mh];B[bm];W[an]C[Old variation in the opper right, sufficient here.];B[al]C[(1704)
];W[kk];B[bl];W[kl];B[ak];W[km];B[am];W[bm];B[al]C[(1705)
]LB[nq:A][sf:B]C[A = +?  (7)
B = +?  (7)
]
(;W[nq]C[(1706)
];B[mq]C[(1707)
]C[Black's group in the upper right has 6 + 1 lilberties.];W[oq]C[(1708)
];B[qr];W[nq];B[qs];W[ss];B[sq]C[(1709)
];W[lq];B[sp];W[fr];B[er];W[fs];B[es];W[gs];B[gq];W[gp];B[fp];W[ed];B[dd];W[gj];B[fi];W[sf];B[ha];W[ia];B[gc];W[kd];B[sr];W[nh];B[pm];W[nm];B[pk];W[sg];B[sj]C[B + 8(7)])
))))))))))
