(;GM[1]FF[4]SZ[19]
GN[Follow-up]
PC[http://senseis.xmp.net/?GokyoShumyoSection1Problem9/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection1Problem9/Solution

Follow-up]
PL[W]

AB[na][oa][nb][sb][nc][oc][pc][qd][qe][re]
AW[qa][ob][pb][rb][qc][rc][rd]

;W[sc]C[W1]MN[1]
;B[pa]C[B2]MN[2]
;W[sa]C[W3]MN[3]
;B[qb]C[B4]MN[4]

;
)
