(;GM[1]FF[4]SZ[19]
GN[Not so easy]
PC[http://senseis.xmp.net/?BeginnerExercise129/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise129/Attempts

Not so easy]
PL[B]

AB[oo][po][qo][ro][op][oq][or][pr][ps]
AW[pp][qp][rp][pq][rq][qr]
CR[qr]
LB[so:a][sp:b][qq:c]

;B[rs]C[B1]MN[1]
;W[qs]C[W2]MN[2]
;B[rr]C[B3]MN[3]
;W[sr]C[W4]MN[4]

;CR[qr]
LB[so:a][sp:b][qq:c]
)
