(;GM[1]FF[4]SZ[19]
GN[Black to play and kill by [oiotoshi\]]
PC[http://senseis.xmp.net/?GokyoShumyoSection5Problem30/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection5Problem30/Attempts

Black to play and kill by [oiotoshi\]]
PL[B]

AB[db][eb][fb][cc][gc][bd][cd][ed][gd][be][ge][cf]
AW[gb][hb][dc][ec][fc][dd][fd][ce][ef]

;B[ee]C[B1]MN[1]
;W[de]C[W2]MN[2]
;B[df]C[B3]MN[3]
;W[fe]C[W4]MN[4]
;B[ff]C[B5]MN[5]

;
)
