(;GM[1]FF[4]SZ[19]
GN[W1 is the key point]
PC[http://senseis.xmp.net/?TesujiFromGames9/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?TesujiFromGames9/Solution

W1 is the key point]
PL[W]

AB[fc][ic][lc][pc][ld][pd][qd][ce][ke][ne][oe][pe][qe][ff][kf][mf][pf][fg][kg][ng][og][gh][gi][li][pi][qi][bj][dj][ej][fj][hj][ij][mj][nj][ck][ik][ok][pk][qk][cl][dl][el][hl][nl][bm][fm][hm][om][dn][fn][hn][in][nn][bo][io][jo][lo][no][oo][bp][lp][op][kq][lq][oq][pq][qq][br][qr][rr]
AW[dc][mc][oc][cd][md][de][le][me][lf][qf][rf][eg][lg][pg][dh][fh][mh][nh][oh][ph][qh][bi][ci][fi][oi][cj][gj][oj][pj][qj][bk][dk][ek][fk][gk][hk][nk][bl][fl][gl][il][jl][gm][im][km][mm][nm][gn][jn][on][pn][go][mo][po][ro][cp][dp][kp][np][qp][sp][bq][cq][fq][iq][nq][rq][sr]
LB[mk:a][ln:b]

;W[ll]C[W1]MN[1]
;B[ml]C[B2]MN[2]
;W[kn]C[W3]MN[3]
;B[ko]C[B4]MN[4]
;W[kk]C[W5]MN[5]

;LB[mk:a][ln:b]
)
