(;GM[1]FF[4]SZ[19]
GN[Reference]
PC[http://senseis.xmp.net/?BeginnerExercise42/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise42/Solution

Reference]
PL[W]

AB[qq][rq][pr][rr][rs]
AW[po][qp][rp][oq][pq][nr][qr]
LB[rn:c][ro:b][sp:a]

;W[sq]C[W1]MN[1]
;B[sr]C[B2]MN[2]
;W[ps]C[W3]MN[3]
;B[qs]C[B4]MN[4]
;W[os]C[W5]MN[5]

;LB[rn:c][ro:b][sp:a]
)
