(;GM[1]FF[4]SZ[19]
GN[21-30]
PC[http://senseis.xmp.net/?MostDifficultProblemEver/ThreeAmateursSolution]AP[GoWiki:2009]
DT[2011-02-25]
C[Diagram from http://senseis.xmp.net/?MostDifficultProblemEver/ThreeAmateursSolution

21-30]
PL[B]

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][mj][ak][ek][lk][qk][rk][sk][al][el][il][ll][ol][pl][ql][am][bm][em][lm][qm][rm][dn][fn][ln][mn][qn][co][fo][ko][no][oo][po][bp][cp][ep][pp][sp][fq][pq][qq][sq][cr][nr][pr][bs][ns][os][ps]
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][nk][ok][dl][jl][ml][nl][rl][sl][hm][jm][mm][om][sm][bn][cn][en][jn][nn][on][pn][rn][sn][mo][qo][ro][so][ap][hp][kp][lp][mp][op][qp][rp][eq][rq][ar][ir][mr][or][rr][ms]

;B[rj]C[B21]MN[21]
;W[qi]C[W22]MN[22]
;B[np]C[B23]MN[23]
;W[rs]C[W24]MN[24]
;B[sr]C[B25]MN[25]
;W[oq]C[W26]MN[26]
;B[mq]C[B27]MN[27]
;W[lr]C[W28]MN[28]
;B[lq]C[B29]MN[29]
;W[kr]C[W30]MN[30]

;
)
