(;GM[1]FF[4]SZ[19]
GN[Solution.]
PC[http://senseis.xmp.net/?BeginnerExercise11/Discussion]AP[GoWiki:2009]
DT[2011-12-11]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise11/Discussion

Solution.]
PL[B]

AB[fq][gq][hq][iq][jq][kq][lq][mq][nq][fr][nr][gs][js][ks]
AW[gr][hr][ir][jr][kr][lr][mr][hs][ms][ns]

;B[or]C[B1]MN[1]
;W[os]C[W2]MN[2]
;B[pr]C[B3]MN[3]
;W[ps]C[W4]MN[4]
;B[qr]C[B5]MN[5]
;W[fs]C[W6]MN[6]
;B[er]C[B7]MN[7]
;W[es]C[W8]MN[8]
;B[dr]C[B9]MN[9]

;
)
