(;GM[1]FF[4]SZ[19]
GN[Go Seigen's recommendation (I)]
PC[http://senseis.xmp.net/?TwoSpaceExtensionUnobviousAnswers]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?TwoSpaceExtensionUnobviousAnswers

Go Seigen's recommendation (I)]
PL[B]

AB[oc][qd][cf][ci][qp][fq][iq][pq]
AW[dc][cd][dg][ck][qk][qn][dp][dq]

;B[df]C[B1]MN[1]
;W[cg]C[W2]MN[2]
;B[eg]C[B3]MN[3]
;W[bf]C[W4]MN[4]
;B[ef]C[B5]MN[5]
;W[bh]C[W6]MN[6]
;B[ei]C[B7]MN[7]

;
)
