(;GM[1]FF[4]SZ[19]
GN[External kos before the other liberty is filled]
PC[https://senseis.xmp.net/?RectangularSixInTheCorner]AP[GoWiki:2009]
DT[2020-04-18]
C[Diagram from https://senseis.xmp.net/?RectangularSixInTheCorner

External kos before the other liberty is filled]
PL[W]

AB[ca][cb][cc][ad][bd][cd]
AW[fa][db][eb][fb][dc][dd][be][ce][de][af][bf]
CR[ae]

;W[ab]C[W1]MN[1]
;B[bb]C[B2]MN[2]
;W[ac]C[W3]MN[3]
;B[aa]C[B4]MN[4]
;W[da]C[W5]MN[5]
;B[bc]C[B6]MN[6]

;CR[ae]
)
