(;GM[1]FF[4]SZ[19]
GN[Prevention]
PC[https://senseis.xmp.net/?33PointInvasion]AP[GoWiki:2009]
DT[2019-11-21]
C[Diagram from https://senseis.xmp.net/?33PointInvasion

Prevention]
PL[B]

AB[dd]
LB[cc:a][dc:b][fc:c][cd:b]

;B[cf]C[B1]MN[1]

;LB[cc:a][dc:b][fc:c][cd:b]
)
