(;GM[1]FF[4]SZ[19]
GN[High extension]
PC[http://senseis.xmp.net/?posting=10338]AP[GoWiki:2009]
DT[2014-12-09]
C[Diagram from http://senseis.xmp.net/?posting=10338

High extension]
PL[W]

AB[cc][dd][df][cj]
AW[cb][db][fc][ic]

;W[ce]C[W1]MN[1]
;B[de]C[B2]MN[2]
;W[bc]C[W3]MN[3]
;B[cf]C[B4]MN[4]

;
)
