(;GM[1]FF[4]SZ[19]
GN[black to force ko ?]
PC[http://senseis.xmp.net/?GokyoShumyoSection5Problem9/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection5Problem9/Attempts

black to force ko ?]
PL[B]

AB[fa][ha][ia][db][eb][gb][hb][jb][cc][ic][jc][cd][hd][id][de][he][ff][gf]
AW[ja][ka][fb][kb][dc][ec][fc][gc][hc][lc][gd][ge][ie][ke][hf][if]

;B[kc]C[B1]MN[1]
;W[lb]C[W2]MN[2]
;B[kd]C[B3]MN[3]
;W[ld]C[W4]MN[4]
;B[je]C[B5]MN[5]
;W[jf]C[W6]MN[6]
;B[ib]C[B7]MN[7]

;
)
