(;GM[1]FF[4]SZ[19]
GN[Black kills white, now ''a'' and ''b'' are [miai\]]
PC[http://senseis.xmp.net/?HermanHiddema/DifficultProblemSolution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?HermanHiddema/DifficultProblemSolution

Black kills white, now ''a'' and ''b'' are [miai\]]
PL[B]

AB[bb][ib][kb][bc][ic][bd][dd][id][be][de][ee][he][gf][if]
AW[hb][cc][dc][ec][hc][ed][fd][gd][hd]
LB[ca:a][ga:b]

;B[ha]C[B1]MN[1]
;W[ea]C[W2]MN[2]
;B[fb]C[B3]MN[3]
;W[gb]C[W4]MN[4]
;B[fc]C[B5]MN[5]
;W[cb]C[W6]MN[6]
;B[da]C[B7]MN[7]

;LB[ca:a][ga:b]
)
