(;GM[1]FF[4]SZ[19]
GN[W cannot avoid Ko]
PC[http://senseis.xmp.net/?GokyoShumyoSection3Problem80/Attempts]AP[GoWiki:2009]
DT[2011-01-06]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection3Problem80/Attempts

W cannot avoid Ko]
PL[W]

AB[bb][eb][bc][cc][fc][gc][hc][de][he][bf][cf][ef][ff][bh]
AW[ba][cb][db][dc][dd][ed][fd][gd][ce]

;W[cd]C[W1]MN[1]
;B[ad]C[B2]MN[2]
;W[ae]C[W3]MN[3]
;B[be]C[B4]MN[4]
;W[bd]C[W5]MN[5]
;B[ab]C[B6]MN[6]
;W[ca]C[W7]MN[7]
;B[af]C[B8]MN[8]
;W[aa]C[W9]MN[9]

;
)
