(;GM[1]FF[4]SZ[19]
GN[Variation at 4 - Black's best]
PC[http://senseis.xmp.net/?GokyoShumyoSection1Problem70/Discussion]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection1Problem70/Discussion

Variation at 4 - Black's best]
PL[W]

AB[cn][bo][do][dp][ep][eq][gq][br][fr][es]
AW[ap][bp][cp][dq][dr][er][ds]

;W[cr]C[W1]MN[1]
;B[as]C[B2]MN[2]
;W[fs]C[W3]MN[3]
;B[gs]C[B4]MN[4]

;
)
