(;GM[1]FF[4]SZ[19]
GN[Seki. Black can play 'a' to get a ko.]
PC[http://senseis.xmp.net/?L1Group]AP[GoWiki:2009]
DT[2011-11-28]
C[Diagram from http://senseis.xmp.net/?L1Group

Seki. Black can play 'a' to get a ko.]
PL[B]

AB[cb][db][cc][bd][cd]
AW[eb][dc][fc][dd][be][ce][ee][bg]
LB[ca:a]

;B[bb]C[B1]MN[1]
;W[ac]C[W2]MN[2]
;B[ad]C[B3]MN[3]
;W[ab]C[W4]MN[4]
;B[da]C[B5]MN[5]
;W[ba]C[W6]MN[6]

;LB[ca:a]
)
