(;GM[1]FF[4]SZ[19]
GN[White to play]
PC[http://senseis.xmp.net/?XuanxuanQijingProblem173/Solution]AP[GoWiki:2009]
DT[2013-04-01]
C[Diagram from http://senseis.xmp.net/?XuanxuanQijingProblem173/Solution

White to play]
PL[W]

AB[mm][nm][mn][on][mo][no][oo][mp][jq][kq][mq][mr]
AW[ml][nl][lm][om][pm][ln][pn][lo][po][hp][ip][jp][kp][np][op][iq][nq][nr][pr]

;W[ir]C[W1]MN[1]
;B[jr]C[B2]MN[2]
;W[js]C[W3]MN[3]
;B[ks]C[B4]MN[4]
;W[lq]C[W5]MN[5]
;B[is]C[B6]MN[6]
;W[lr]C[W7]MN[7]

;
)
