(;GM[1]FF[4]SZ[19]
GN[Perfect shape]
PC[http://senseis.xmp.net/?ThreeSpaceExtension]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?ThreeSpaceExtension

Perfect shape]
PL[W]

AB[ec][ic]
AW[cd]
CR[ic]
LB[hc:a]

;W[dc]C[W1]MN[1]
;B[ed]C[B2]MN[2]
;W[de]C[W3]MN[3]

;CR[ic]
LB[hc:a]
)
