(;
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[rf]C[(2229)
]LB[gf:A][pd:B][nb:C]C[A = -?  (-1)
B = +?  (2)
C = +?  (1)
]
(;B[pd]C[(2299)
]LB[pc:A][ob:B]C[A = +?  (2)
B = +  (2)
]
(;W[pc]C[(2300)
]LB[nb:A][mc:B]C[A = +?  (2)
B = +?  (2)
]
(;B[mc]C[(2304)
];W[nb];B[nc];W[oc];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]C[(2305)
];W[aj];B[bl];W[ao];B[am];W[bk];B[al]LB[mg:A][la:B]C[A = +  (2)
B = +?  (2)
]
(;W[mg]C[(2306)
]LB[la:A][ma:B]C[A = +?  (2)
B = +  (2)
]
(;B[ma]C[(2318)
];W[ob];B[dm];W[kb];B[dj];W[ka];B[eg];W[la];B[af];W[kc];B[cf];W[lf];B[ch];W[ne];B[nf];W[qd];B[ci];W[sf];B[br];W[kn];B[bq];W[lo];B[as];W[li];B[bm];W[an]C[Black is unable to connect at 8, this would lose him a decisive liberty..];B[al]C[(2319)
];W[mh];B[ak];W[kd];B[bl];W[md];B[am];W[bm];B[al]C[(2320)
];W[fb];B[eb];W[gb];B[gc];W[ec];B[fa];W[ha];B[dc];W[nh];B[nq];W[oq]C[(2321)
];B[ak];W[kk];B[bl];W[am];B[al]C[(2322)
];W[kl];B[ak];W[km];B[pm];W[nm];B[qr];W[qg];B[qs];W[ss];B[sq]C[(2323)
];W[gj];B[fi];W[fr];B[er];W[fs];B[es];W[gs];B[gd];W[hd];B[ed];W[gq];B[fp];W[sg];B[sp];W[pg];B[sr]C[B + 4(2)]))
)))))))))
