(;GM[1]FF[4]SZ[19]
GN[refutation?]
PC[http://senseis.xmp.net/?GokyoShumyoSection2Problem16/Attempts]AP[GoWiki:2009]
DT[2010-02-03]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection2Problem16/Attempts

refutation?]
PL[B]

AB[fb][ec][fc][ad][bd][cd][dd]
AW[ea][eb][bc][cc][dc]
LB[bb:a]

;B[ca]C[B1]MN[1]
;W[ac]C[W2]MN[2]
;B[db]C[B3]MN[3]
;W[ba]C[W4]MN[4]
;B[fa]C[B5]MN[5]
;W[cb]C[W6]MN[6]
;B[da]C[B7]MN[7]
;W[ab]C[W8]MN[8]

;LB[bb:a]
)
