(;GM[1]FF[4]SZ[19]
GN[If Black secures left (5 at marked)]
PC[http://senseis.xmp.net/?BeginnerExercise137/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise137/Solution

If Black secures left (5 at marked)]
PL[B]

AB[da][ea][ga][ia][ka][db][fb][jb][lb][nb][bc][dc][ec][fc][hc][jc][kc][oc][bd][cd][ld][md][nd]
AW[ca][ha][cb][gb][hb][ib][cc][gc][ic][lc][mc][qc][dd][ed][fd][jd][kd][ie][qe]
CR[ia]

;B[bb]C[B1]MN[1]
;W[ja]C[W2]MN[2]
;B[kb]C[B3]MN[3]
;W[mb]C[W4]MN[4]
;W[ma]C[W6]MN[6]
;B[na]C[B7]MN[7]

;CR[ia]
)
