(;GM[1]FF[4]SZ[19]
GN[Solution]
PC[http://senseis.xmp.net/?IgoHatsuyoRonProblem66/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?IgoHatsuyoRonProblem66/Solution

Solution]
PL[W]

AB[na][oa][nb][pb][nc][pc][qc][rc][sc][qd][rd][sd]
AW[lb][ob][oc][md][od][me][pe][re][rf]

;W[pa]C[W1]MN[1]
;B[qa]C[B2]MN[2]
;W[rb]C[W3]MN[3]

;
)
