(;GM[1]FF[4]SZ[19]
GN[B4 has an alternative in special cases]
PC[http://senseis.xmp.net/?JGroup]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?JGroup

B4 has an alternative in special cases]
PL[W]

AB[cb][cc][ad][cd][be]
AW[db][fb][dc][dd][ce][bf][cf]
LB[bg:a][bh:b]

;W[ca]C[W1]MN[1]
;B[ba]C[B2]MN[2]
;W[ab]C[W3]MN[3]
;B[af]C[B4]MN[4]
;W[bc]C[W5]MN[5]

;LB[bg:a][bh:b]
)
