(;GM[1]FF[4]SZ[19]
GN[[TimK\]: W1 here fails.  Black lives in seki.]
PC[http://senseis.xmp.net/?KyuExercise81/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?KyuExercise81/Attempts

[TimK\]: W1 here fails.  Black lives in seki.]
PL[W]

AB[ab][bb][db][eb][fb][cc]
AW[gb][hb][bc][dc][fc][bd][dd][fd][ce][ee]

;W[ca]C[W1]MN[1]
;B[cb]C[B2]MN[2]
;W[ba]C[W3]MN[3]
;B[fa]C[B4]MN[4]
;W[da]C[W5]MN[5]

;
)
