(;GM[1]FF[4]SZ[19]
GN[Block on the top side]
PC[http://senseis.xmp.net/?44DoubleLowApproachAttachExtend33Invasion]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?44DoubleLowApproachAttachExtend33Invasion

Block on the top side]
PL[W]

AB[dd][fd][fe]
AW[fc][gd][cf]
LB[ic:a][id:b][be:c]

;W[cc]C[W1]MN[1]
;B[ec]C[B2]MN[2]
;W[gc]C[W3]MN[3]
;B[cd]C[B4]MN[4]
;W[bd]C[W5]MN[5]
;B[fb]C[B6]MN[6]
;W[bb]C[W7]MN[7]
;B[gb]C[B8]MN[8]

;LB[ic:a][id:b][be:c]
)
