(;GM[1]FF[4]SZ[19]
GN[White has Ko to live]
PC[http://senseis.xmp.net/?BeginnerExercise140/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise140/Attempts

White has Ko to live]
PL[B]

AB[cb][db][bc][dc][dd][ce][de][bf][df]
AW[bb][cc][bd][cd][be][cf][cg][ch]

;B[ae]C[B1]MN[1]
;W[ac]C[W2]MN[2]
;B[ag]C[B3]MN[3]
;W[bg]C[W4]MN[4]
;B[ba]C[B5]MN[5]
;W[af]C[W6]MN[6]

;
)
