(;GM[1]FF[4]SZ[19]
GN[W1 and W3 as sacrifices]
PC[http://senseis.xmp.net/?RTGProblem23/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?RTGProblem23/Solution

W1 and W3 as sacrifices]
PL[W]

AB[in][kn][mn][on][pn][qn][rn][oo][ip][iq][jq][kq][nq][rq][sq][mr][qr][sr][qs][rs]
AW[po][qo][ro][jp][kp][lp][mp][np][op][pp][rp][sp][pq][qq][pr][ps]
LB[ms:a]

;W[nr]C[W1]MN[1]
;B[ns]C[B2]MN[2]
;W[lr]C[W3]MN[3]
;B[lq]C[B4]MN[4]
;W[mq]C[W5]MN[5]
;B[or]C[B6]MN[6]
;W[os]C[W7]MN[7]
;B[kr]C[B8]MN[8]
;W[oq]C[W9]MN[9]

;LB[ms:a]
)
