(;GM[1]FF[4]SZ[19]
GN[Black to live]
PC[http://senseis.xmp.net/?GokyoShumyoSection1Problem11/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection1Problem11/Solution

Black to live]
PL[B]

AB[na][ob][pb][qc][rc][rd]
AW[mb][nb][oc][pc][qd][sd][qe][re]
CR[na][qa]

;B[ra]C[B1]MN[1]
;W[sb]C[W2]MN[2]
;B[sc]C[B3]MN[3]
;W[rb]C[W4]MN[4]
;B[qb]C[B5]MN[5]
;W[oa]C[W6]MN[6]
;B[pa]C[B7]MN[7]

;CR[na][qa]
)
