(;GM[1]FF[4]SZ[19]
GN[White cannot kill this way]
PC[http://senseis.xmp.net/?L1Group]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?L1Group

White cannot kill this way]
PL[W]

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

;W[da]C[W1]MN[1]
;B[ab]C[B2]MN[2]
;W[ba]C[W3]MN[3]
;B[bb]C[B4]MN[4]

;CR[ea]
LB[ca:a]
)
