(;GM[1]FF[4]SZ[19]
GN[Solution]
PC[http://senseis.xmp.net/?XuanxuanQijingProblem52/Solution]AP[GoWiki:2009]
DT[2013-04-01]
C[Diagram from http://senseis.xmp.net/?XuanxuanQijingProblem52/Solution

Solution]
PL[B]

AB[on][pn][no][qo][ro][np][qp][mq][qq][mr][rr]
AW[ql][qn][rn][po][pp][pq][nr][or][pr][qr]

;B[sp]C[B1]MN[1]
;W[rs]C[W2]MN[2]
;B[rq]C[B3]MN[3]
;W[sr]C[W4]MN[4]
;B[qs]C[B5]MN[5]
;W[ps]C[W6]MN[6]
;B[ns]C[B7]MN[7]

;
)
