(;GM[1]FF[4]SZ[19]
GN[Go Seigen's comments]
PC[http://senseis.xmp.net/?ProbingDuringTheAttachExtendJoseki]AP[GoWiki:2009]
DT[2011-12-26]
C[Diagram from http://senseis.xmp.net/?ProbingDuringTheAttachExtendJoseki

Go Seigen's comments]
PL[B]

AB[pd][pp]
AW[dd][dq]

;B[do]C[B1]MN[1]
;W[co]C[W2]MN[2]
;B[cn]C[B3]MN[3]
;W[cp]C[W4]MN[4]
;B[fc]C[B5]MN[5]
;W[dn]C[W6]MN[6]
;B[cf]C[B7]MN[7]

;
)
