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

Ideal extensions]
PL[B]

AB[fc][eo][ep][eq]
AW[pf][qf]
CR[fc]

;B[ic]C[B1]MN[1]
;W[qj]C[W2]MN[2]
;B[jq]C[B3]MN[3]

;CR[fc]
)
