(;GM[1]FF[4]SZ[19]
GN[Ko]
PC[http://senseis.xmp.net/?IgoHatsuyoRonProblem119/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?IgoHatsuyoRonProblem119/Attempts

Ko]
PL[B]

AB[ha][ia][cb][ib][lb][dc][fc][ic][lc][nc][cd][ed][id][jd][ld][ge][he][je][ke]
AW[ja][db][gb][hb][kb][ec][hc][kc][mc][hd][kd][md][ie][le][if][jf][kf][mf]

;B[ga]C[B1]MN[1]
;W[fb]C[W2]MN[2]
;B[fa]C[B3]MN[3]
;W[ea]C[W4]MN[4]

;
)
