(;GM[1]FF[4]SZ[19]
GN[]
PC[http://senseis.xmp.net/?XuanxuanQijingProblem309/Solution]AP[GoWiki:2009]
DT[2013-04-01]
C[Diagram from http://senseis.xmp.net/?XuanxuanQijingProblem309/Solution

]
PL[W]

AB[rl][sl][qm][rn][po][ro][pp][rp][pq][rq][pr]
AW[qk][rk][sk][pl][pm][sm][pn][qn][sn][oo][so][op][sp][oq][qq][or][qr][sr][ps]

;W[ql]C[W1]MN[1]
;B[rm]C[B2]MN[2]
;W[sq]C[W3]MN[3]
;B[rr]C[B4]MN[4]

;
)
