(;GM[1]FF[4]SZ[19]
GN[When to play Black 1.]
PC[http://senseis.xmp.net/?HolIgorStrugglesWithTheHighExtension]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?HolIgorStrugglesWithTheHighExtension

When to play Black 1.]
PL[B]

AB[cc][dd][df][cj]
AW[db][fc][ic]
CR[db][cj]
LB[ch:b][dh:a]

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

;CR[db][cj]
LB[ch:b][dh:a]
)
