(;GM[1]FF[4]SZ[19]
GN[Example]
PC[http://senseis.xmp.net/?OD1PAug21Problem/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?OD1PAug21Problem/Solution

Example]
PL[B]

AB[op][sp][rq][rr][rs]
AW[rn][no][oo][po][mp][qp][rp][mq][mr]

;B[or]C[B1]MN[1]
;W[os]C[W2]MN[2]
;B[ps]C[B3]MN[3]
;W[pr]C[W4]MN[4]
;B[pq]C[B5]MN[5]
;W[qs]C[W6]MN[6]
;B[qr]C[B7]MN[7]

;
)
